v3.10.0.1
Consolidated Statements of Income - USD ($)
shares in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Revenues:          
Total operating revenues     $ 23,495,000,000 $ 23,031,000,000 $ 19,896,000,000
Operating Expenses:          
Other operations and maintenance     5,889,000,000 5,739,000,000 5,382,000,000
Depreciation and amortization     3,131,000,000 3,010,000,000 2,502,000,000
Taxes other than income taxes     1,315,000,000 1,250,000,000 1,113,000,000
Estimated loss on plants     1,097,000,000 3,362,000,000 428,000,000
Goodwill impairment     42,000,000    
Impairment charges     210,000,000 0 0
Gain on dispositions, net     (291,000,000) (40,000,000) 1,000,000
Gain on disposition     301,000,000 42,000,000 2,000,000
Depreciation and amortization     3,549,000,000 3,457,000,000 2,923,000,000
Total operating expenses     19,304,000,000 20,698,000,000 15,410,000,000
Operating Income     4,191,000,000 2,333,000,000 4,486,000,000
Other Income and (Expense):          
Allowance for equity funds used during construction     138,000,000 160,000,000 202,000,000
Earnings from equity method investments     148,000,000 106,000,000 59,000,000
Interest expense, net of amounts capitalized     (1,842,000,000) (1,694,000,000) (1,317,000,000)
Other income (expense), net     114,000,000 163,000,000 50,000,000
Total other income and (expense)     (1,442,000,000) (1,265,000,000) (1,006,000,000)
Earnings Before Income Taxes     2,749,000,000 1,068,000,000 3,480,000,000
Income taxes     449,000,000 142,000,000 951,000,000
Net Income     2,300,000,000 926,000,000 2,529,000,000
Dividends on preferred and preference stock of subsidiaries     16,000,000 38,000,000 45,000,000
Net income attributable to noncontrolling interests     58,000,000 46,000,000 36,000,000
Net Income (Loss)     $ 2,226,000,000 $ 842,000,000 $ 2,448,000,000
Earnings per share —          
Basic (in dollars per share)     $ 2.18 $ 0.84 $ 2.57
Diluted (in dollars per share)     $ 2.17 $ 0.84 $ 2.55
Average number of shares of common stock outstanding — (in millions)          
Basic (in shares)     1,020 1,000 951
Diluted (in shares)     1,025 1,008 958
Retail electric revenues          
Operating Revenues:          
Total operating revenues     $ 15,222,000,000 $ 15,330,000,000 $ 15,234,000,000
Wholesale revenues, non-affiliates          
Operating Revenues:          
Total operating revenues     2,516,000,000 2,426,000,000 1,926,000,000
Other electric revenues          
Operating Revenues:          
Total operating revenues     664,000,000 681,000,000 698,000,000
Fuel          
Operating Expenses:          
Cost of revenue     4,637,000,000 4,400,000,000 4,361,000,000
Purchased power          
Operating Expenses:          
Cost of revenue     971,000,000 863,000,000 750,000,000
Natural gas revenues          
Operating Revenues:          
Total operating revenues     3,854,000,000 3,791,000,000 1,596,000,000
Operating Expenses:          
Cost of revenue     1,539,000,000 1,601,000,000 613,000,000
Other revenues          
Operating Revenues:          
Total operating revenues     1,239,000,000 803,000,000 442,000,000
Operating Expenses:          
Cost of revenue     806,000,000 513,000,000 260,000,000
Alabama Power          
Operating Revenues:          
Total operating revenues     6,032,000,000 6,039,000,000 5,889,000,000
Operating Expenses:          
Other operations and maintenance     1,669,000,000 1,709,000,000 1,557,000,000
Depreciation and amortization     764,000,000 736,000,000 703,000,000
Taxes other than income taxes     389,000,000 384,000,000 380,000,000
Purchased power, non-affiliates     216,000,000 170,000,000 166,000,000
Purchased power, affiliates     216,000,000 158,000,000 168,000,000
Depreciation and amortization     917,000,000 888,000,000 844,000,000
Total operating expenses     4,555,000,000 4,382,000,000 4,271,000,000
Operating Income     1,477,000,000 1,657,000,000 1,618,000,000
Other Income and (Expense):          
Allowance for equity funds used during construction     62,000,000 39,000,000 28,000,000
Interest expense, net of amounts capitalized     (323,000,000) (305,000,000) (302,000,000)
Other income (expense), net     20,000,000 43,000,000 26,000,000
Total other income and (expense)     (241,000,000) (223,000,000) (248,000,000)
Earnings Before Income Taxes     1,236,000,000 1,434,000,000 1,370,000,000
Income taxes     291,000,000 568,000,000 531,000,000
Net Income     945,000,000 866,000,000 839,000,000
Dividends on preferred and preference stock of subsidiaries     15,000,000 18,000,000 17,000,000
Net Income (Loss)     930,000,000 848,000,000 822,000,000
Alabama Power | Retail electric revenues          
Operating Revenues:          
Total operating revenues     5,367,000,000 5,458,000,000 5,322,000,000
Alabama Power | Wholesale revenues, non-affiliates          
Operating Revenues:          
Total operating revenues     279,000,000 276,000,000 283,000,000
Alabama Power | Wholesale revenues, affiliates          
Operating Revenues:          
Total operating revenues     119,000,000 97,000,000 69,000,000
Alabama Power | Fuel          
Operating Expenses:          
Cost of revenue     1,301,000,000 1,225,000,000 1,297,000,000
Alabama Power | Other revenues          
Operating Revenues:          
Total operating revenues     267,000,000 208,000,000 215,000,000
Georgia Power          
Operating Revenues:          
Total operating revenues     8,420,000,000 8,310,000,000 8,383,000,000
Operating Expenses:          
Other operations and maintenance     1,860,000,000 1,724,000,000 2,003,000,000
Depreciation and amortization     923,000,000 895,000,000 855,000,000
Taxes other than income taxes     437,000,000 409,000,000 405,000,000
Estimated loss on plants     1,060,000,000 0 0
Purchased power, non-affiliates     430,000,000 416,000,000 361,000,000
Purchased power, affiliates     723,000,000 622,000,000 518,000,000
Depreciation and amortization     1,142,000,000 1,100,000,000 1,063,000,000
Total operating expenses     7,131,000,000 5,737,000,000 5,949,000,000
Operating Income     1,289,000,000 2,573,000,000 2,434,000,000
Other Income and (Expense):          
Interest expense, net of amounts capitalized     (397,000,000) (419,000,000) (388,000,000)
Other income (expense), net     115,000,000 104,000,000 81,000,000
Total other income and (expense)     (282,000,000) (315,000,000) (307,000,000)
Earnings Before Income Taxes     1,007,000,000 2,258,000,000 2,127,000,000
Income taxes     214,000,000 830,000,000 780,000,000
Net Income     793,000,000 1,428,000,000 1,347,000,000
Dividends on preferred and preference stock of subsidiaries     0 14,000,000 17,000,000
Net Income (Loss)     793,000,000 1,414,000,000 1,330,000,000
Georgia Power | Retail electric revenues          
Operating Revenues:          
Total operating revenues     7,752,000,000 7,738,000,000 7,772,000,000
Georgia Power | Wholesale revenues, non-affiliates          
Operating Revenues:          
Total operating revenues     163,000,000 163,000,000 175,000,000
Georgia Power | Wholesale revenues, affiliates          
Operating Revenues:          
Total operating revenues     24,000,000 26,000,000 42,000,000
Georgia Power | Fuel          
Operating Expenses:          
Cost of revenue     1,698,000,000 1,671,000,000 1,807,000,000
Georgia Power | Other revenues          
Operating Revenues:          
Total operating revenues     481,000,000 383,000,000 394,000,000
Mississippi Power          
Operating Revenues:          
Total operating revenues     1,265,000,000 1,187,000,000 1,163,000,000
Operating Expenses:          
Other operations and maintenance     313,000,000 291,000,000 317,000,000
Depreciation and amortization     169,000,000 161,000,000 132,000,000
Taxes other than income taxes     107,000,000 104,000,000 109,000,000
Estimated loss on plants     37,000,000 3,362,000,000 428,000,000
Purchased power, affiliates     41,000,000 25,000,000 34,000,000
Depreciation and amortization     177,000,000 198,000,000 157,000,000
Total operating expenses     1,072,000,000 4,338,000,000 1,363,000,000
Operating Income     193,000,000 (3,151,000,000) (200,000,000)
Other Income and (Expense):          
Allowance for equity funds used during construction     0 72,000,000 124,000,000
Interest expense, net of amounts capitalized     (76,000,000) (42,000,000) (74,000,000)
Other income (expense), net     17,000,000 1,000,000 (2,000,000)
Total other income and (expense)     (59,000,000) 31,000,000 48,000,000
Earnings Before Income Taxes     134,000,000 (3,120,000,000) (152,000,000)
Income taxes     (102,000,000) (532,000,000) (104,000,000)
Net Income     236,000,000 (2,588,000,000) (48,000,000)
Dividends on preferred and preference stock of subsidiaries     1,000,000 2,000,000 2,000,000
Net Income (Loss)     235,000,000 (2,590,000,000) (50,000,000)
Mississippi Power | Retail electric revenues          
Operating Revenues:          
Total operating revenues     889,000,000 854,000,000 859,000,000
Mississippi Power | Wholesale revenues, non-affiliates          
Operating Revenues:          
Total operating revenues     263,000,000 259,000,000 261,000,000
Mississippi Power | Wholesale revenues, affiliates          
Operating Revenues:          
Total operating revenues     91,000,000 56,000,000 26,000,000
Mississippi Power | Fuel          
Operating Expenses:          
Cost of revenue     405,000,000 395,000,000 343,000,000
Mississippi Power | Other revenues          
Operating Revenues:          
Total operating revenues     22,000,000 18,000,000 17,000,000
Southern Power          
Operating Revenues:          
Total operating revenues     2,205,000,000 2,075,000,000 1,577,000,000
Operating Expenses:          
Other operations and maintenance     395,000,000 386,000,000 354,000,000
Depreciation and amortization     493,000,000 503,000,000 352,000,000
Taxes other than income taxes     46,000,000 48,000,000 23,000,000
Impairment charges     156,000,000 0 0
Gain on disposition     (2,000,000) 0 0
Purchased power, non-affiliates     176,000,000 149,000,000 102,000,000
Depreciation and amortization     524,000,000 536,000,000 370,000,000
Total operating expenses     1,963,000,000 1,707,000,000 1,287,000,000
Operating Income     242,000,000 368,000,000 290,000,000
Other Income and (Expense):          
Interest expense, net of amounts capitalized     (183,000,000) (191,000,000) (117,000,000)
Other income (expense), net     23,000,000 1,000,000 6,000,000
Total other income and (expense)     (160,000,000) (190,000,000) (111,000,000)
Earnings Before Income Taxes     82,000,000 178,000,000 179,000,000
Income taxes     (164,000,000) (939,000,000) (195,000,000)
Net Income     246,000,000 1,117,000,000 374,000,000
Net income attributable to noncontrolling interests     59,000,000 46,000,000 36,000,000
Net Income (Loss)     187,000,000 1,071,000,000 338,000,000
Southern Power | Wholesale revenues, non-affiliates          
Operating Revenues:          
Total operating revenues     1,757,000,000 1,671,000,000 1,146,000,000
Southern Power | Wholesale revenues, affiliates          
Operating Revenues:          
Total operating revenues     435,000,000 392,000,000 419,000,000
Southern Power | Fuel          
Operating Expenses:          
Cost of revenue     699,000,000 621,000,000 456,000,000
Southern Power | Other revenues          
Operating Revenues:          
Total operating revenues       12,000,000 $ 12,000,000
Southern Company Gas          
Operating Revenues:          
Total operating revenues $ 1,652,000,000   3,909,000,000 3,920,000,000  
Operating Expenses:          
Other operations and maintenance 480,000,000   981,000,000 945,000,000  
Taxes other than income taxes 71,000,000   211,000,000 184,000,000  
Goodwill impairment 0   42,000,000 0  
Gain on dispositions, net 0   (291,000,000) 0  
Gain on disposition 0   291,000,000 0  
Depreciation and amortization 238,000,000   500,000,000 501,000,000  
Merger-related expenses 41,000,000   0 0  
Total operating expenses 1,453,000,000   2,994,000,000 3,260,000,000  
Operating Income 199,000,000   915,000,000 660,000,000  
Other Income and (Expense):          
Earnings from equity method investments 60,000,000   148,000,000 106,000,000  
Interest expense, net of amounts capitalized (81,000,000)   (228,000,000) (200,000,000)  
Other income (expense), net 12,000,000   1,000,000 44,000,000  
Total other income and (expense) (9,000,000)   (79,000,000) (50,000,000)  
Earnings Before Income Taxes 190,000,000   836,000,000 610,000,000  
Income taxes 76,000,000   464,000,000 367,000,000  
Net Income 114,000,000   372,000,000 243,000,000  
Net income attributable to noncontrolling interests 0   0 0  
Net Income (Loss) 114,000,000   372,000,000 243,000,000  
Southern Company Gas | Natural gas revenues          
Operating Revenues:          
Total operating revenues 1,591,000,000   3,874,000,000 3,787,000,000  
Operating Expenses:          
Cost of revenue 613,000,000   1,539,000,000 1,601,000,000  
Southern Company Gas | Alternative revenue programs          
Operating Revenues:          
Total operating revenues 5,000,000   (20,000,000) 4,000,000  
Southern Company Gas | Other revenues          
Operating Revenues:          
Total operating revenues 56,000,000   55,000,000 129,000,000  
Operating Expenses:          
Cost of revenue $ 10,000,000   $ 12,000,000 $ 29,000,000  
Predecessor | Southern Company Gas          
Operating Revenues:          
Total operating revenues   $ 1,905,000,000      
Operating Expenses:          
Other operations and maintenance   452,000,000      
Taxes other than income taxes   99,000,000      
Goodwill impairment   0      
Gain on dispositions, net   0      
Gain on disposition   0      
Depreciation and amortization   206,000,000      
Merger-related expenses   56,000,000      
Total operating expenses   1,582,000,000      
Operating Income   323,000,000      
Other Income and (Expense):          
Earnings from equity method investments   2,000,000      
Interest expense, net of amounts capitalized   (96,000,000)      
Other income (expense), net   3,000,000      
Total other income and (expense)   (91,000,000)      
Earnings Before Income Taxes   232,000,000      
Income taxes   87,000,000      
Net Income   145,000,000      
Net income attributable to noncontrolling interests   14,000,000      
Net Income (Loss)   131,000,000      
Predecessor | Southern Company Gas | Natural gas revenues          
Operating Revenues:          
Total operating revenues   1,845,000,000      
Operating Expenses:          
Cost of revenue   755,000,000      
Predecessor | Southern Company Gas | Alternative revenue programs          
Operating Revenues:          
Total operating revenues   (4,000,000)      
Predecessor | Southern Company Gas | Other revenues          
Operating Revenues:          
Total operating revenues   64,000,000      
Operating Expenses:          
Cost of revenue   $ 14,000,000