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Segment and Related Information - Schedule of Business Segment Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Total operating revenues $ 6,463 $ 5,748 $ 13,109 $ 12,228  
Net income 1,203 838 2,332 1,700  
Total assets 141,937   141,937   $ 139,331
SOUTHERN Co GAS          
Segment Reporting Information [Line Items]          
Total operating revenues 831 852 2,538 2,728  
Net income 108 85 517 393  
Total assets 25,055   25,055   25,083
Operating Segments | SOUTHERN Co GAS          
Segment Reporting Information [Line Items]          
Total operating revenues 827 847 2,533 2,719  
Net income 111 86 508 387  
Total assets 26,199   26,199   26,055
Operating Segments | Gas distribution operations | SOUTHERN Co GAS          
Segment Reporting Information [Line Items]          
Total operating revenues 749 764 2,212 2,383  
Net income 80 60 382 281  
Total assets 23,025   23,025   22,906
Operating Segments | Gas Pipeline Investments | SOUTHERN Co GAS          
Segment Reporting Information [Line Items]          
Total operating revenues 8 8 16 16  
Net income 22 19 52 50  
Total assets 1,542   1,542   1,534
Operating Segments | Gas marketing services | SOUTHERN Co GAS          
Segment Reporting Information [Line Items]          
Total operating revenues 70 75 305 320  
Net income 9 7 74 56  
Total assets 1,632   1,632   1,615
Operating Segments | All Other          
Segment Reporting Information [Line Items]          
Total operating revenues 222 180 383 346  
Net income (181) (157) (368) (311)  
Total assets 2,828   2,828   2,446
Operating Segments | All Other | SOUTHERN Co GAS          
Segment Reporting Information [Line Items]          
Total operating revenues 7 9 13 22  
Net income (3) (1) 9 6  
Total assets 9,795   9,795   9,675
Eliminations          
Segment Reporting Information [Line Items]          
Total operating revenues (46) (48) (83) (93)  
Net income (2) 2 (11) (2)  
Total assets (652)   (652)   (843)
Eliminations | SOUTHERN Co GAS          
Segment Reporting Information [Line Items]          
Total operating revenues (3) (4) (8) (13)  
Net income 0 $ 0 0 $ 0  
Total assets $ (10,939)   $ (10,939)   $ (10,647)