SOUTHERN CO
10-K · 2025-02-20T00:00:00Z · 0000092122-25-000018234 tables
Cover (2)
Statements (49)
- R3.htmConsolidated Statements of Income - Southern
9952151 - Statement - Consolidated Statements of Income - Southern
- R4.htmConsolidated Statements of Comprehensive Income - Southern
9952152 - Statement - Consolidated Statements of Comprehensive Income - Southern
- R5.htmConsolidated Statements of Comprehensive Income - Southern (Parenthetical)
9952153 - Statement - Consolidated Statements of Comprehensive Income - Southern (Parenthetical)
- R6.htmConsolidated Statements of Cash Flows - Southern
9952154 - Statement - Consolidated Statements of Cash Flows - Southern
- R7.htmConsolidated Statements of Cash Flows - Southern (Parenthetical)
9952155 - Statement - Consolidated Statements of Cash Flows - Southern (Parenthetical)
- R8.htmConsolidated Balance Sheets - Southern
9952156 - Statement - Consolidated Balance Sheets - Southern
- R9.htmConsolidated Balance Sheets - Southern (Parenthetical)
9952157 - Statement - Consolidated Balance Sheets - Southern (Parenthetical)
- R10.htmConsolidated Statements of Stockholders' Equity - Southern
9952158 - Statement - Consolidated Statements of Stockholders' Equity - Southern
- R11.htmConsolidated Statements of Stockholders' Equity - Southern (Parenthetical)
9952159 - Statement - Consolidated Statements of Stockholders' Equity - Southern (Parenthetical)
- R12.htmStatements of Income - APC
9952160 - Statement - Statements of Income - APC
- R13.htmStatements of Comprehensive Income - APC
9952161 - Statement - Statements of Comprehensive Income - APC
- R14.htmStatements of Comprehensive Income - APC (Parenthetical)
9952162 - Statement - Statements of Comprehensive Income - APC (Parenthetical)
- R15.htmStatements of Cash Flows - APC
9952163 - Statement - Statements of Cash Flows - APC
- R16.htmStatements of Cash Flows - APC (Parenthetical)
9952164 - Statement - Statements of Cash Flows - APC (Parenthetical)
- R17.htmBalance Sheets - APC
9952165 - Statement - Balance Sheets - APC
- R18.htmBalance Sheets - APC (Parenthetical)
9952166 - Statement - Balance Sheets - APC (Parenthetical)
- R19.htmStatements of Common Stockholders' Equity - APC
9952167 - Statement - Statements of Common Stockholders' Equity - APC
- R20.htmStatements of Income - GPC
9952168 - Statement - Statements of Income - GPC
- R21.htmStatements of Comprehensive Income - GPC
9952169 - Statement - Statements of Comprehensive Income - GPC
- R22.htmStatements of Comprehensive Income - GPC (Parenthetical)
9952170 - Statement - Statements of Comprehensive Income - GPC (Parenthetical)
- R23.htmStatements of Cash Flows - GPC
9952171 - Statement - Statements of Cash Flows - GPC
- R24.htmStatements of Cash Flows - GPC (Parenthetical)
9952172 - Statement - Statements of Cash Flows - GPC (Parenthetical)
- R25.htmBalance Sheets - GPC
9952173 - Statement - Balance Sheets - GPC
- R26.htmBalance Sheets - GPC (Parenthetical)
9952174 - Statement - Balance Sheets - GPC (Parenthetical)
- R27.htmStatements of Common Stockholders' Equity - GPC
9952175 - Statement - Statements of Common Stockholders' Equity - GPC
- R28.htmStatements of Income - MPC
9952176 - Statement - Statements of Income - MPC
- R29.htmStatements of Comprehensive Income - MPC
9952177 - Statement - Statements of Comprehensive Income - MPC
- R30.htmStatements of Comprehensive Income - MPC (Parenthetical)
9952178 - Statement - Statements of Comprehensive Income - MPC (Parenthetical)
- R31.htmStatements of Cash Flows - MPC
9952179 - Statement - Statements of Cash Flows - MPC
- R32.htmBalance Sheets - MPC
9952180 - Statement - Balance Sheets - MPC
- R33.htmBalance Sheets - MPC (Parenthetical)
9952181 - Statement - Balance Sheets - MPC (Parenthetical)
- R34.htmStatements of Common Stockholders' Equity - MPC
9952182 - Statement - Statements of Common Stockholders' Equity - MPC
- R35.htmConsolidated Statements of Income - SPC
9952183 - Statement - Consolidated Statements of Income - SPC
- R36.htmConsolidated Statements of Comprehensive Income - SPC
9952184 - Statement - Consolidated Statements of Comprehensive Income - SPC
- R37.htmConsolidated Statements of Comprehensive Income - SPC (Parenthetical)
9952185 - Statement - Consolidated Statements of Comprehensive Income - SPC (Parenthetical)
- R38.htmConsolidated Statements of Cash Flows - SPC
9952186 - Statement - Consolidated Statements of Cash Flows - SPC
- R39.htmConsolidated Statements of Cash Flows - SPC (Parenthetical)
9952187 - Statement - Consolidated Statements of Cash Flows - SPC (Parenthetical)
- R40.htmConsolidated Balance Sheets - SPC
9952188 - Statement - Consolidated Balance Sheets - SPC
- R41.htmConsolidated Balance Sheets - SPC (Parenthetical)
9952189 - Statement - Consolidated Balance Sheets - SPC (Parenthetical)
- R42.htmConsolidated Statements of Stockholders' Equity - SPC
9952190 - Statement - Consolidated Statements of Stockholders' Equity - SPC
- R43.htmConsolidated Statements of Income - GAS
9952191 - Statement - Consolidated Statements of Income - GAS
- R44.htmConsolidated Statements of Income - GAS (Parenthetical)
9952192 - Statement - Consolidated Statements of Income - GAS (Parenthetical)
- R45.htmConsolidated Statements of Comprehensive Income - GAS
9952193 - Statement - Consolidated Statements of Comprehensive Income - GAS
- R46.htmConsolidated Statements of Comprehensive Income - GAS (Parenthetical)
9952194 - Statement - Consolidated Statements of Comprehensive Income - GAS (Parenthetical)
- R47.htmConsolidated Statements of Cash Flows - GAS
9952195 - Statement - Consolidated Statements of Cash Flows - GAS
- R48.htmConsolidated Statements of Cash Flows - GAS (Parenthetical)
9952196 - Statement - Consolidated Statements of Cash Flows - GAS (Parenthetical)
- R49.htmConsolidated Balance Sheets - GAS
9952197 - Statement - Consolidated Balance Sheets - GAS
- R50.htmConsolidated Balance Sheets - GAS (Parenthetical)
9952198 - Statement - Consolidated Balance Sheets - GAS (Parenthetical)
- R51.htmConsolidated Statements of Common Stockholders' Equity - GAS
9952199 - Statement - Consolidated Statements of Common Stockholders' Equity - GAS
Notes (20)
- R52.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
9952200 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
- R53.htmREGULATORY MATTERS
9952201 - Disclosure - REGULATORY MATTERS
- R54.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES
9952202 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES
- R55.htmREVENUE FROM CONTRACTS WITH CUSTOMERS
9952203 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS
- R56.htmPROPERTY, PLANT, AND EQUIPMENT
9952204 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT
- R57.htmASSET RETIREMENT OBLIGATIONS
9952205 - Disclosure - ASSET RETIREMENT OBLIGATIONS
- R58.htmCONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS
9952206 - Disclosure - CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS
- R59.htmFINANCING
9952207 - Disclosure - FINANCING
- R60.htmLEASES
9952208 - Disclosure - LEASES
- R61.htmINCOME TAXES
9952209 - Disclosure - INCOME TAXES
- R62.htmRETIREMENT BENEFITS
9952210 - Disclosure - RETIREMENT BENEFITS
- R63.htmSTOCK COMPENSATION
9952211 - Disclosure - STOCK COMPENSATION
- R64.htmFAIR VALUE MEASUREMENTS
9952212 - Disclosure - FAIR VALUE MEASUREMENTS
- R65.htmDERIVATIVES
9952213 - Disclosure - DERIVATIVES
- R66.htmACQUISITIONS AND DISPOSITIONS
9952214 - Disclosure - ACQUISITIONS AND DISPOSITIONS
- R67.htmSEGMENT AND RELATED INFORMATION
9952215 - Disclosure - SEGMENT AND RELATED INFORMATION
- R68.htmVALUATION AND QUALIFYING ACCOUNTS
9952216 - Disclosure - VALUATION AND QUALIFYING ACCOUNTS
- R69.htmInsider Trading Arrangements
995445 - Disclosure - Insider Trading Arrangements
- R70.htmInsider Trading Policies and Procedures
995447 - Disclosure - Insider Trading Policies and Procedures
- R71.htmCybersecurity Risk Management and Strategy Disclosure
995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure
Policies (1)
Tables (16)
- R73.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
9955512 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
- R74.htmREGULATORY MATTERS (Tables)
9955513 - Disclosure - REGULATORY MATTERS (Tables)
- R75.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES (Tables)
9955514 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES (Tables)
- R76.htmREVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)
9955515 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)
- R77.htmPROPERTY, PLANT, AND EQUIPMENT (Tables)
9955516 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT (Tables)
- R78.htmASSET RETIREMENT OBLIGATIONS (Tables)
9955517 - Disclosure - ASSET RETIREMENT OBLIGATIONS (Tables)
- R79.htmCONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS (Tables)
9955518 - Disclosure - CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS (Tables)
- R80.htmFINANCING (Tables)
9955519 - Disclosure - FINANCING (Tables)
- R81.htmLEASES (Tables)
9955520 - Disclosure - LEASES (Tables)
- R82.htmINCOME TAXES (Tables)
9955521 - Disclosure - INCOME TAXES (Tables)
- R83.htmRETIREMENT BENEFITS (Tables)
9955522 - Disclosure - RETIREMENT BENEFITS (Tables)
- R84.htmSTOCK COMPENSATION (Tables)
9955523 - Disclosure - STOCK COMPENSATION (Tables)
- R85.htmFAIR VALUE MEASUREMENTS (Tables)
9955524 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)
- R86.htmDERIVATIVES (Tables)
9955525 - Disclosure - DERIVATIVES (Tables)
- R87.htmACQUISITIONS AND DISPOSITIONS (Tables)
9955526 - Disclosure - ACQUISITIONS AND DISPOSITIONS (Tables)
- R88.htmSEGMENT AND RELATED INFORMATION (Tables)
9955527 - Disclosure - SEGMENT AND RELATED INFORMATION (Tables)
Details (146)
- R89.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - General (Narrative) (Details)
9955528 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - General (Narrative) (Details)
- R90.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Costs for Affiliate Transactions (Details)
9955529 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Costs for Affiliate Transactions (Details)
- R91.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Affiliate Transactions (Narrative) (Details)
9955530 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Affiliate Transactions (Narrative) (Details)
- R92.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Narrative) (Details)
9955531 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Narrative) (Details)
- R93.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Revenue (Narrative) (Details)
9955532 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Revenue (Narrative) (Details)
- R94.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income and Other Taxes (Narrative) (Details)
9955533 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income and Other Taxes (Narrative) (Details)
- R95.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Total AFUDC and Interest Capitalized (Details)
9955534 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Total AFUDC and Interest Capitalized (Details)
- R96.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Average AFUDC Composite Rates (Details)
9955535 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Average AFUDC Composite Rates (Details)
- R97.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment and Goodwill and Other Intangible Assets and Liabilities (Narrative) (Details)
9955536 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment and Goodwill and Other Intangible Assets and Liabilities (Narrative) (Details)
- R98.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Goodwill Balances (Details)
9955537 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Goodwill Balances (Details)
- R99.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Other Intangible Assets (Details)
9955538 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Other Intangible Assets (Details)
- R100.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Amortization of Other Intangible Assets (Details)
9955539 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Amortization of Other Intangible Assets (Details)
- R101.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Transmission Receivables/Prepayments (Narrative) (Details)
9955540 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Transmission Receivables/Prepayments (Narrative) (Details)
- R102.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash, Cash Equivalents, and Restricted Cash (Details)
9955541 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash, Cash Equivalents, and Restricted Cash (Details)
- R103.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Storm Damage and Reliability Reserves (Details)
9955542 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Storm Damage and Reliability Reserves (Details)
- R104.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Natural Gas for Sale (Narrative) (Details)
9955543 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Natural Gas for Sale (Narrative) (Details)
- R105.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Narrative) (Details)
9955544 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Narrative) (Details)
- R106.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Narrative) (Details)
9955545 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Narrative) (Details)
- R107.htmSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of AOCI (Loss) Balances, Net of Tax Effects (Details)
9955546 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of AOCI (Loss) Balances, Net of Tax Effects (Details)
- R108.htmREGULATORY MATTERS - Schedule of Regulatory Assets and Liabilities (Details)
9955547 - Disclosure - REGULATORY MATTERS - Schedule of Regulatory Assets and Liabilities (Details)
- R109.htmREGULATORY MATTERS - APC Certificate of Convenience and Necessity and RGC (Details)
9955548 - Disclosure - REGULATORY MATTERS - APC Certificate of Convenience and Necessity and RGC (Details)
- R110.htmREGULATORY MATTERS - APC Rate RSE (Details)
9955549 - Disclosure - REGULATORY MATTERS - APC Rate RSE (Details)
- R111.htmREGULATORY MATTERS - APC Rate CNP New Plant (Details)
9955550 - Disclosure - REGULATORY MATTERS - APC Rate CNP New Plant (Details)
- R112.htmREGULATORY MATTERS - APC Rate CNP (Details)
9955551 - Disclosure - REGULATORY MATTERS - APC Rate CNP (Details)
- R113.htmREGULATORY MATTERS - APC Rate ECR (Details)
9955552 - Disclosure - REGULATORY MATTERS - APC Rate ECR (Details)
- R114.htmREGULATORY MATTERS - APC Accounting Orders and Plant Greene County (Details)
9955553 - Disclosure - REGULATORY MATTERS - APC Accounting Orders and Plant Greene County (Details)
- R115.htmREGULATORY MATTERS - APC Rate NDR and Reliability Reserve Accounting Order (Details)
9955554 - Disclosure - REGULATORY MATTERS - APC Rate NDR and Reliability Reserve Accounting Order (Details)
- R116.htmREGULATORY MATTERS - GPC Tariffs (Details)
9955555 - Disclosure - REGULATORY MATTERS - GPC Tariffs (Details)
- R117.htmREGULATORY MATTERS - GPC Rate Plans and Integrated Resource Plan (Details)
9955556 - Disclosure - REGULATORY MATTERS - GPC Rate Plans and Integrated Resource Plan (Details)
- R118.htmREGULATORY MATTERS - GPC Transmission Asset Sales, Fuel Cost, and Storm Damage Recovery (Details)
9955557 - Disclosure - REGULATORY MATTERS - GPC Transmission Asset Sales, Fuel Cost, and Storm Damage Recovery (Details)
- R119.htmREGULATORY MATTERS - GPC Nuclear Construction and Cost and Schedule (Details)
9955558 - Disclosure - REGULATORY MATTERS - GPC Nuclear Construction and Cost and Schedule (Details)
- R120.htmREGULATORY MATTERS - GPC Joint Owner Contracts (Details)
9955559 - Disclosure - REGULATORY MATTERS - GPC Joint Owner Contracts (Details)
- R121.htmREGULATORY MATTERS - GPC Regulatory Matters (Details)
9955560 - Disclosure - REGULATORY MATTERS - GPC Regulatory Matters (Details)
- R122.htmREGULATORY MATTERS - MPC Performance Evaluation Plan (Details)
9955561 - Disclosure - REGULATORY MATTERS - MPC Performance Evaluation Plan (Details)
- R123.htmREGULATORY MATTERS - MPC Integrated Resource Plan (Details)
9955562 - Disclosure - REGULATORY MATTERS - MPC Integrated Resource Plan (Details)
- R124.htmREGULATORY MATTERS - MPC Environmental Compliance Overview Plan (Details)
9955563 - Disclosure - REGULATORY MATTERS - MPC Environmental Compliance Overview Plan (Details)
- R125.htmREGULATORY MATTERS - MPC Fuel Cost Recovery and Ad Valorem Tax Adjustment (Details)
9955564 - Disclosure - REGULATORY MATTERS - MPC Fuel Cost Recovery and Ad Valorem Tax Adjustment (Details)
- R126.htmREGULATORY MATTERS - MPC System Restoration Rider and Reliability Reserve Accounting Order (Details)
9955565 - Disclosure - REGULATORY MATTERS - MPC System Restoration Rider and Reliability Reserve Accounting Order (Details)
- R127.htmREGULATORY MATTERS - MPC Municipal and Rural Associations Tariff (Details)
9955566 - Disclosure - REGULATORY MATTERS - MPC Municipal and Rural Associations Tariff (Details)
- R128.htmREGULATORY MATTERS - GAS Schedule of Utility Regulation and Rate Design (Details)
9955567 - Disclosure - REGULATORY MATTERS - GAS Schedule of Utility Regulation and Rate Design (Details)
- R129.htmREGULATORY MATTERS - GAS Infrastructure Replacement Programs and Capital Projects and Natural Gas Recovery (Details)
9955568 - Disclosure - REGULATORY MATTERS - GAS Infrastructure Replacement Programs and Capital Projects and Natural Gas Recovery (Details)
- R130.htmREGULATORY MATTERS - GAS Schedule of Infrastructure Replacement Programs and Capital Projects (Details)
9955569 - Disclosure - REGULATORY MATTERS - GAS Schedule of Infrastructure Replacement Programs and Capital Projects (Details)
- R131.htmREGULATORY MATTERS - GAS Rate Proceedings and Deferral of Incremental COVID-19 Costs (Details)
9955570 - Disclosure - REGULATORY MATTERS - GAS Rate Proceedings and Deferral of Incremental COVID-19 Costs (Details)
- R132.htmREGULATORY MATTERS - GAS Schedule of Unrecognized Ratemaking Amounts (Details)
9955571 - Disclosure - REGULATORY MATTERS - GAS Schedule of Unrecognized Ratemaking Amounts (Details)
- R133.htmREGULATORY MATTERS - GAS Capital Projects Schedule of QIP (Details)
9955572 - Disclosure - REGULATORY MATTERS - GAS Capital Projects Schedule of QIP (Details)
- R134.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES - SO Litigation (Details)
9955573 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES - SO Litigation (Details)
- R135.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES - GPC Litigation (Details)
9955574 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES - GPC Litigation (Details)
- R136.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES - Environmental Remediation (Details)
9955575 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Environmental Remediation (Details)
- R137.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES - Nuclear Fuel Disposal Costs and Nuclear Insurance (Details)
9955576 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Nuclear Fuel Disposal Costs and Nuclear Insurance (Details)
- R138.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES - MPC and Traditional Electric Operating Companies Other Matters (Details)
9955577 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES - MPC and Traditional Electric Operating Companies Other Matters (Details)
- R139.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES - Commitments (Details)
9955578 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Commitments (Details)
- R140.htmCONTINGENCIES, COMMITMENTS, AND GUARANTEES - Guarantees (Details)
9955579 - Disclosure - CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Guarantees (Details)
- R141.htmREVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregate Revenue Sources (Details)
9955580 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregate Revenue Sources (Details)
- R142.htmREVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details)
9955581 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details)
- R143.htmREVENUE FROM CONTRACTS WITH CUSTOMERS - Performance Obligations (Details)
9955582 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Performance Obligations (Details)
- R144.htmPROPERTY, PLANT, AND EQUIPMENT - Property, Plant and Equipment (Details)
9955583 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Property, Plant and Equipment (Details)
- R145.htmPROPERTY, PLANT, AND EQUIPMENT - Additional Information (Narrative) (Details)
9955584 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Additional Information (Narrative) (Details)
- R146.htmPROPERTY, PLANT, AND EQUIPMENT - Deferred Cloud Implementation Costs (Details)
9955585 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Deferred Cloud Implementation Costs (Details)
- R147.htmPROPERTY, PLANT, AND EQUIPMENT - Composite Straight-Line Rates (Details)
9955586 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Composite Straight-Line Rates (Details)
- R148.htmPROPERTY, PLANT, AND EQUIPMENT - Southern Power Useful Lives (Details)
9955587 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Southern Power Useful Lives (Details)
- R149.htmPROPERTY, PLANT, AND EQUIPMENT - Ownership and Investment in Jointly-Owned Facilities (Details)
9955588 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Ownership and Investment in Jointly-Owned Facilities (Details)
- R150.htmASSET RETIREMENT OBLIGATIONS - Details of AROs Included in the Balance Sheets (Details)
9955589 - Disclosure - ASSET RETIREMENT OBLIGATIONS - Details of AROs Included in the Balance Sheets (Details)
- R151.htmASSET RETIREMENT OBLIGATIONS - Narrative (Details)
9955590 - Disclosure - ASSET RETIREMENT OBLIGATIONS - Narrative (Details)
- R152.htmASSET RETIREMENT OBLIGATIONS - Investment Securities in the Funds (Details)
9955591 - Disclosure - ASSET RETIREMENT OBLIGATIONS - Investment Securities in the Funds (Details)
- R153.htmASSET RETIREMENT OBLIGATIONS - Fair Value Increases (Decreases) of the Funds (Details)
9955592 - Disclosure - ASSET RETIREMENT OBLIGATIONS - Fair Value Increases (Decreases) of the Funds (Details)
- R154.htmASSET RETIREMENT OBLIGATIONS - Accumulated Provisions for the External Decommissioning Trust Funds (Details)
9955593 - Disclosure - ASSET RETIREMENT OBLIGATIONS - Accumulated Provisions for the External Decommissioning Trust Funds (Details)
- R155.htmASSET RETIREMENT OBLIGATIONS - Estimated Costs of Decommissioning (Details)
9955594 - Disclosure - ASSET RETIREMENT OBLIGATIONS - Estimated Costs of Decommissioning (Details)
- R156.htmCONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Southern Company (Details)
9955595 - Disclosure - CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Southern Company (Details)
- R157.htmCONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - SEGCO Equity Method Investments Narrative (Details)
9955596 - Disclosure - CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - SEGCO Equity Method Investments Narrative (Details)
- R158.htmCONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Narrative (Details)
9955597 - Disclosure - CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Narrative (Details)
- R159.htmCONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Balance Sheet Information (Details)
9955598 - Disclosure - CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Balance Sheet Information (Details)
- R160.htmFINANCING - Long-Term Debt (Details)
9955599 - Disclosure - FINANCING - Long-Term Debt (Details)
- R161.htmFINANCING - Maturities of Long-Term Debt (Details)
9955600 - Disclosure - FINANCING - Maturities of Long-Term Debt (Details)
- R162.htmFINANCING - DOE Loan Guarantee Borrowings (Details)
9955601 - Disclosure - FINANCING - DOE Loan Guarantee Borrowings (Details)
- R163.htmFINANCING - Equity Units (Details)
9955602 - Disclosure - FINANCING - Equity Units (Details)
- R164.htmFINANCING - Convertible Senior Notes (Details)
9955603 - Disclosure - FINANCING - Convertible Senior Notes (Details)
- R165.htmFINANCING - Bank Credit Arrangements (Details)
9955604 - Disclosure - FINANCING - Bank Credit Arrangements (Details)
- R166.htmFINANCING - Bank Credit Arrangements Narrative (Details)
9955605 - Disclosure - FINANCING - Bank Credit Arrangements Narrative (Details)
- R167.htmFINANCING - Notes Payable (Details)
9955606 - Disclosure - FINANCING - Notes Payable (Details)
- R168.htmFINANCING - Outstanding Classes of Capital Stock Narrative (Details)
9955607 - Disclosure - FINANCING - Outstanding Classes of Capital Stock Narrative (Details)
- R169.htmFINANCING - Diluted Earnings Per Share (Details)
9955608 - Disclosure - FINANCING - Diluted Earnings Per Share (Details)
- R170.htmFINANCING - Preferred Stock Redemption (Details)
9955609 - Disclosure - FINANCING - Preferred Stock Redemption (Details)
- R171.htmFINANCING - Dividend Restrictions and Structural Considerations Narrative (Details)
9955610 - Disclosure - FINANCING - Dividend Restrictions and Structural Considerations Narrative (Details)
- R172.htmLEASES - Major Categories of Lease Obligations (Details)
9955611 - Disclosure - LEASES - Major Categories of Lease Obligations (Details)
- R173.htmLEASES - Additional Information (Details)
9955612 - Disclosure - LEASES - Additional Information (Details)
- R174.htmLEASES - Balance Sheet Amounts Recorded for Operating and Financing Leases (Details)
9955613 - Disclosure - LEASES - Balance Sheet Amounts Recorded for Operating and Financing Leases (Details)
- R175.htmLEASES - Lease Costs (Details)
9955614 - Disclosure - LEASES - Lease Costs (Details)
- R176.htmLEASES - Other Information (Details)
9955615 - Disclosure - LEASES - Other Information (Details)
- R177.htmLEASES - Maturities of Lease Liabilities (Details)
9955616 - Disclosure - LEASES - Maturities of Lease Liabilities (Details)
- R178.htmLEASES - Lease Income (Details)
9955617 - Disclosure - LEASES - Lease Income (Details)
- R179.htmLEASES - Undiscounted Cash Flows to be Received Under Tolling Arrangements Accounted for as Sales-type Leases (Details)
9955618 - Disclosure - LEASES - Undiscounted Cash Flows to be Received Under Tolling Arrangements Accounted for as Sales-type Leases (Details)
- R180.htmLEASES - Undiscounted Cash Flows to be Received Under PPAs Accounted for as Operating Leases (Details)
9955619 - Disclosure - LEASES - Undiscounted Cash Flows to be Received Under PPAs Accounted for as Operating Leases (Details)
- R181.htmLEASES - Leveraged Leases (Narrative) (Details)
9955620 - Disclosure - LEASES - Leveraged Leases (Narrative) (Details)
- R182.htmINCOME TAXES - Current and Deferred Income Tax Provisions (Details)
9955621 - Disclosure - INCOME TAXES - Current and Deferred Income Tax Provisions (Details)
- R183.htmINCOME TAXES - Narrative (Details)
9955622 - Disclosure - INCOME TAXES - Narrative (Details)
- R184.htmINCOME TAXES - Amortization of Deferred Credits (Details)
9955623 - Disclosure - INCOME TAXES - Amortization of Deferred Credits (Details)
- R185.htmINCOME TAXES - Reconciliation of Federal Statutory Income Tax Rate (Details)
9955624 - Disclosure - INCOME TAXES - Reconciliation of Federal Statutory Income Tax Rate (Details)
- R186.htmINCOME TAXES - Deferred Tax Assets and Liabilities (Details)
9955625 - Disclosure - INCOME TAXES - Deferred Tax Assets and Liabilities (Details)
- R187.htmINCOME TAXES - Federal ITC/PTC Carryforwards (Details)
9955626 - Disclosure - INCOME TAXES - Federal ITC/PTC Carryforwards (Details)
- R188.htmINCOME TAXES - NOL Carryforwards (Details)
9955627 - Disclosure - INCOME TAXES - NOL Carryforwards (Details)
- R189.htmINCOME TAXES - Changes in Unrecognized Tax Benefits (Details)
9955628 - Disclosure - INCOME TAXES - Changes in Unrecognized Tax Benefits (Details)
- R190.htmRETIREMENT BENEFITS - Narrative (Details)
9955629 - Disclosure - RETIREMENT BENEFITS - Narrative (Details)
- R191.htmRETIREMENT BENEFITS - Actuarial Assumptions (Details)
9955630 - Disclosure - RETIREMENT BENEFITS - Actuarial Assumptions (Details)
- R192.htmRETIREMENT BENEFITS - Schedule of Health Care Cost Trend Rates (Details)
9955631 - Disclosure - RETIREMENT BENEFITS - Schedule of Health Care Cost Trend Rates (Details)
- R193.htmRETIREMENT BENEFITS - Accumulated Benefit Obligation (Details)
9955632 - Disclosure - RETIREMENT BENEFITS - Accumulated Benefit Obligation (Details)
- R194.htmRETIREMENT BENEFITS - Changes in Projected Benefit Obligations and Fair Value of Plan Assets (Details)
9955633 - Disclosure - RETIREMENT BENEFITS - Changes in Projected Benefit Obligations and Fair Value of Plan Assets (Details)
- R195.htmRETIREMENT BENEFITS - Projected Benefit Plan Obligations (Details)
9955634 - Disclosure - RETIREMENT BENEFITS - Projected Benefit Plan Obligations (Details)
- R196.htmRETIREMENT BENEFITS - Amounts Recognized in Balance Sheets and Amounts in AOCI (Details)
9955635 - Disclosure - RETIREMENT BENEFITS - Amounts Recognized in Balance Sheets and Amounts in AOCI (Details)
- R197.htmRETIREMENT BENEFITS - Regulatory Assets (Details)
9955636 - Disclosure - RETIREMENT BENEFITS - Regulatory Assets (Details)
- R198.htmRETIREMENT BENEFITS - Changes in Regulatory Assets (Details)
9955637 - Disclosure - RETIREMENT BENEFITS - Changes in Regulatory Assets (Details)
- R199.htmRETIREMENT BENEFITS - Components of Accumulated OCI (Details)
9955638 - Disclosure - RETIREMENT BENEFITS - Components of Accumulated OCI (Details)
- R200.htmRETIREMENT BENEFITS - Components of Net Periodic Benefit Cost and Estimated Future Benefit Payments (Details)
9955639 - Disclosure - RETIREMENT BENEFITS - Components of Net Periodic Benefit Cost and Estimated Future Benefit Payments (Details)
- R201.htmRETIREMENT BENEFITS - Fair Values of Pension Plan and Other Postretirement Benefit Plan Assets (Details)
9955640 - Disclosure - RETIREMENT BENEFITS - Fair Values of Pension Plan and Other Postretirement Benefit Plan Assets (Details)
- R202.htmRETIREMENT BENEFITS - 401K Plan Matching Contributions (Details)
9955641 - Disclosure - RETIREMENT BENEFITS - 401K Plan Matching Contributions (Details)
- R203.htmSTOCK COMPENSATION - Schedule of Employees Participating in Stock-Based Compensation Programs (Details)
9955642 - Disclosure - STOCK COMPENSATION - Schedule of Employees Participating in Stock-Based Compensation Programs (Details)
- R204.htmSTOCK COMPENSATION - Performance Shares Narrative (Details)
9955643 - Disclosure - STOCK COMPENSATION - Performance Shares Narrative (Details)
- R205.htmSTOCK COMPENSATION - Performance Shares, Assumptions Used (Details)
9955644 - Disclosure - STOCK COMPENSATION - Performance Shares, Assumptions Used (Details)
- R206.htmSTOCK COMPENSATION - Performance Shares, Compensation Costs and Related Tax Benefit (Details)
9955645 - Disclosure - STOCK COMPENSATION - Performance Shares, Compensation Costs and Related Tax Benefit (Details)
- R207.htmSTOCK COMPENSATION - Restricted Stock Units Narrative (Details)
9955646 - Disclosure - STOCK COMPENSATION - Restricted Stock Units Narrative (Details)
- R208.htmSTOCK COMPENSATION - Stock Options Narrative (Details)
9955647 - Disclosure - STOCK COMPENSATION - Stock Options Narrative (Details)
- R209.htmSTOCK COMPENSATION - Aggregate Intrinsic Value for Options Exercised (Details)
9955648 - Disclosure - STOCK COMPENSATION - Aggregate Intrinsic Value for Options Exercised (Details)
- R210.htmFAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)
9955649 - Disclosure - FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)
- R211.htmFAIR VALUE MEASUREMENTS - Narrative (Details)
9955650 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details)
- R212.htmFAIR VALUE MEASUREMENTS - Financial Instruments, Carrying Amount Not Equal to Fair Value (Details)
9955651 - Disclosure - FAIR VALUE MEASUREMENTS - Financial Instruments, Carrying Amount Not Equal to Fair Value (Details)
- R213.htmDERIVATIVES - Energy-Related Derivative Contracts (Details)
9955652 - Disclosure - DERIVATIVES - Energy-Related Derivative Contracts (Details)
- R214.htmDERIVATIVES - Narrative (Details)
9955653 - Disclosure - DERIVATIVES - Narrative (Details)
- R215.htmDERIVATIVES - Interest Rate Derivatives (Details)
9955654 - Disclosure - DERIVATIVES - Interest Rate Derivatives (Details)
- R216.htmDERIVATIVES - Foreign Currency Derivatives (Details)
9955655 - Disclosure - DERIVATIVES - Foreign Currency Derivatives (Details)
- R217.htmDERIVATIVES - Derivative Financial Statement Presentation and Amounts With Balance Sheet Offsetting (Details)
9955656 - Disclosure - DERIVATIVES - Derivative Financial Statement Presentation and Amounts With Balance Sheet Offsetting (Details)
- R218.htmDERIVATIVES - Schedule of Unrealized Gain (Loss) Recognized in the Balance Sheet (Details)
9955657 - Disclosure - DERIVATIVES - Schedule of Unrealized Gain (Loss) Recognized in the Balance Sheet (Details)
- R219.htmDERIVATIVES - Pre-Tax Effects of Derivatives Designated as Hedges on AOCI (Details)
9955658 - Disclosure - DERIVATIVES - Pre-Tax Effects of Derivatives Designated as Hedges on AOCI (Details)
- R220.htmDERIVATIVES - Pre-Tax Effects of Derivatives Designated as Hedges on Income (Details)
9955659 - Disclosure - DERIVATIVES - Pre-Tax Effects of Derivatives Designated as Hedges on Income (Details)
- R221.htmDERIVATIVES - Cumulative Basis Adjustments for Fair Value Hedges (Details)
9955660 - Disclosure - DERIVATIVES - Cumulative Basis Adjustments for Fair Value Hedges (Details)
- R222.htmDERIVATIVES - Pre-Tax Effects of Derivatives Not Designated as Hedging (Details)
9955661 - Disclosure - DERIVATIVES - Pre-Tax Effects of Derivatives Not Designated as Hedging (Details)
- R223.htmACQUISITIONS AND DISPOSITIONS - Alabama Power Narrative (Details)
9955662 - Disclosure - ACQUISITIONS AND DISPOSITIONS - Alabama Power Narrative (Details)
- R224.htmACQUISITIONS AND DISPOSITIONS - Southern Power Narrative (Details)
9955663 - Disclosure - ACQUISITIONS AND DISPOSITIONS - Southern Power Narrative (Details)
- R225.htmACQUISITIONS AND DISPOSITIONS - Schedule of Asset Acquisitions (Details)
9955664 - Disclosure - ACQUISITIONS AND DISPOSITIONS - Schedule of Asset Acquisitions (Details)
- R226.htmACQUISITIONS AND DISPOSITIONS - Schedule of Construction Projects (Details)
9955665 - Disclosure - ACQUISITIONS AND DISPOSITIONS - Schedule of Construction Projects (Details)
- R227.htmACQUISITIONS AND DISPOSITIONS - GAS Acquisitions and Dispositions Narrative (Details)
9955666 - Disclosure - ACQUISITIONS AND DISPOSITIONS - GAS Acquisitions and Dispositions Narrative (Details)
- R228.htmSEGMENT AND RELATED INFORMATION - Narrative (Details)
9955667 - Disclosure - SEGMENT AND RELATED INFORMATION - Narrative (Details)
- R229.htmSEGMENT AND RELATED INFORMATION - Financial Data for Business Segments (Details)
9955668 - Disclosure - SEGMENT AND RELATED INFORMATION - Financial Data for Business Segments (Details)
- R230.htmSEGMENT AND RELATED INFORMATION - Electric Utilities' Revenues (Details)
9955669 - Disclosure - SEGMENT AND RELATED INFORMATION - Electric Utilities' Revenues (Details)
- R231.htmSEGMENT AND RELATED INFORMATION - Traditional Electric Companies (Details)
9955670 - Disclosure - SEGMENT AND RELATED INFORMATION - Traditional Electric Companies (Details)
- R232.htmSEGMENT AND RELATED INFORMATION - Southern Power (Details)
9955671 - Disclosure - SEGMENT AND RELATED INFORMATION - Southern Power (Details)
- R233.htmSEGMENT AND RELATED INFORMATION - Gas Revenues (Details)
9955672 - Disclosure - SEGMENT AND RELATED INFORMATION - Gas Revenues (Details)
- R234.htmVALUATION AND QUALIFYING ACCOUNTS (Details)
9955673 - Disclosure - VALUATION AND QUALIFYING ACCOUNTS (Details)