v3.19.2
Cover Page
 6 Months Ended
Jun. 30, 2019
shares
Document Information [Line Items]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Jun. 30, 2019
Document Transition Report false
Entity File Number 1-3526
Entity Registrant Name The Southern Company
Entity Tax Identification Number 58-0690070
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 30 Ivan Allen Jr. Boulevard, N.W.
Entity Address, City or Town Atlanta
Entity Address, State or Province GA
Entity Address, Postal Zip Code 30308
City Area Code 404
Local Phone Number 506-5000
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Shell Company false
Entity Common Stock, Shares Outstanding 1,045,231,646
Entity Central Index Key 0000092122
Amendment Flag false
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q2
Current Fiscal Year End Date --12-31
Entity Emerging Growth Company false
Entity Small Business false
Common Stock, par value $5 per share  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, par value $5 per share
Trading Symbol SO
Security Exchange Name NYSE
Series 2015A 6.25% Junior Subordinated Notes due 2075  
Document Information [Line Items]  
Title of 12(b) Security Series 2015A 6.25% Junior Subordinated Notes due 2075
Trading Symbol SOJA
Security Exchange Name NYSE
Series 2016A 5.25% Junior Subordinated Notes due 2076  
Document Information [Line Items]  
Title of 12(b) Security Series 2016A 5.25% Junior Subordinated Notes due 2076
Trading Symbol SOJB
Security Exchange Name NYSE
Series 2017B 5.25% Junior Subordinated Notes due 2077  
Document Information [Line Items]  
Title of 12(b) Security Series 2017B 5.25% Junior Subordinated Notes due 2077
Trading Symbol SOJC
Security Exchange Name NYSE
ALABAMA POWER CO  
Document Information [Line Items]  
Entity File Number 1-3164
Entity Registrant Name Alabama Power Company
Entity Tax Identification Number 63-0004250
Entity Incorporation, State or Country Code AL
Entity Address, Address Line One 600 North 18th Street
Entity Address, City or Town Birmingham
Entity Address, State or Province AL
Entity Address, Postal Zip Code 35203
City Area Code 205
Local Phone Number 257-1000
Title of 12(b) Security 5.00% Series Class A Preferred Stock
Trading Symbol ALP PR Q
Security Exchange Name NYSE
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Common Stock, Shares Outstanding 30,537,500
Entity Central Index Key 0000003153
Entity Emerging Growth Company false
Entity Small Business false
GEORGIA POWER CO  
Document Information [Line Items]  
Entity File Number 1-6468
Entity Registrant Name Georgia Power Company
Entity Tax Identification Number 58-0257110
Entity Incorporation, State or Country Code GA
Entity Address, Address Line One 241 Ralph McGill Boulevard, N.E.
Entity Address, City or Town Atlanta
Entity Address, State or Province GA
Entity Address, Postal Zip Code 30308
City Area Code 404
Local Phone Number 506-6526
Title of 12(b) Security Series 2017A 5.00% Junior Subordinated Notes due 2077
Trading Symbol GPJA
Security Exchange Name NYSE
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Common Stock, Shares Outstanding 9,261,500
Entity Central Index Key 0000041091
Entity Emerging Growth Company false
Entity Small Business false
MISSISSIPPI POWER CO  
Document Information [Line Items]  
Entity File Number 001-11229
Entity Registrant Name Mississippi Power Company
Entity Tax Identification Number 64-0205820
Entity Incorporation, State or Country Code MS
Entity Address, Address Line One 2992 West Beach Boulevard
Entity Address, City or Town Gulfport
Entity Address, State or Province MS
Entity Address, Postal Zip Code 39501
City Area Code 228
Local Phone Number 864-1211
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Common Stock, Shares Outstanding 1,121,000
Entity Central Index Key 0000066904
Entity Emerging Growth Company false
Entity Small Business false
SOUTHERN POWER CO  
Document Information [Line Items]  
Entity File Number 001-37803
Entity Registrant Name Southern Power Company
Entity Tax Identification Number 58-2598670
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 30 Ivan Allen Jr. Boulevard, N.W.
Entity Address, City or Town Atlanta
Entity Address, State or Province GA
Entity Address, Postal Zip Code 30308
City Area Code 404
Local Phone Number 506-5000
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Common Stock, Shares Outstanding 1,000
Entity Central Index Key 0001160661
Entity Emerging Growth Company false
Entity Small Business false
SOUTHERN POWER CO | Series 2016A 1.000% Senior Notes due 2022  
Document Information [Line Items]  
Title of 12(b) Security Series 2016A 1.000% Senior Notes due 2022
Trading Symbol SO/22B
Security Exchange Name NYSE
SOUTHERN POWER CO | Series 2016B 1.850% Senior Notes due 2026  
Document Information [Line Items]  
Title of 12(b) Security Series 2016B 1.850% Senior Notes due 2026
Trading Symbol SO/26A
Security Exchange Name NYSE
SOUTHERN Co GAS  
Document Information [Line Items]  
Entity File Number 1-14174
Entity Registrant Name Southern Company Gas
Entity Tax Identification Number 58-2210952
Entity Incorporation, State or Country Code GA
Entity Address, Address Line One Ten Peachtree Place, N.E.
Entity Address, City or Town Atlanta
Entity Address, State or Province GA
Entity Address, Postal Zip Code 30309
City Area Code 404
Local Phone Number 584-4000
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Common Stock, Shares Outstanding 100
Entity Central Index Key 0001004155
Entity Emerging Growth Company false
Entity Small Business false