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Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Operating Activities:    
Net income $ 1,356 $ 1,334
Adjustments to reconcile net income to net cash provided from operating activities —    
Depreciation and amortization, total 1,580 1,411
Deferred income taxes 168 351
Other, net (25) (1)
Changes in certain current assets and liabilities —    
Receivables 124 7
Natural gas for sale, net of temporary LIFO liquidation 355 365
Other current assets (27) 66
Accounts payable (555) (394)
Accrued compensation (599) (537)
Other current liabilities (4) (37)
Net cash provided from operating activities 1,226 1,250
Investing Activities:    
Property additions (2,944) (2,437)
Cost of removal, net of salvage (166) (168)
Change in construction payables, net (251) (161)
Other investing activities (60) (68)
Net cash used for investing activities (3,421) (2,834)
Financing Activities:    
Decrease in notes payable, net   (841)
Payment of common stock dividends (776) (736)
Other financing activities (191) (133)
Net cash provided from financing activities 1,542 2,815
Net Change in Cash, Cash Equivalents, and Restricted Cash (653) 1,231
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 1,640 1,101
Cash, Cash Equivalents, and Restricted Cash at End of Period 987 2,332
Supplemental Cash Flow Information:    
Interest, net of amounts capitalized 901 756
Income taxes, net (excludes credit transfers) 0 (1)
Noncash transactions —    
Accrued property additions at end of period 1,049 940
Right-of-use assets obtained under operating leases 41 87
SOUTHERN Co GAS    
Operating Activities:    
Net income 447 418
Adjustments to reconcile net income to net cash provided from operating activities —    
Depreciation and amortization, total 183 167
Deferred income taxes 60 42
Other, net 21 (5)
Changes in certain current assets and liabilities —    
Receivables (51) (115)
Natural gas for sale, net of temporary LIFO liquidation 355 365
Other current assets 30 74
Accounts payable (201) (95)
Accrued taxes 70 73
Accrued compensation (56) (60)
Natural gas cost over recovery (27) (179)
Other current liabilities (23) 2
Net cash provided from operating activities 808 687
Investing Activities:    
Property additions (323) (281)
Cost of removal, net of salvage (16) (16)
Change in construction payables, net 6 (6)
Capital contributions to unconsolidated subsidiaries (27) (19)
Other investing activities 0 1
Net cash used for investing activities (360) (321)
Financing Activities:    
Decrease in notes payable, net (170) (141)
Return of capital to parent company 0 (23)
Payment of common stock dividends (141) (149)
Other financing activities (10) (10)
Net cash provided from financing activities (321) (323)
Net Change in Cash, Cash Equivalents, and Restricted Cash 127 43
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 15 44
Cash, Cash Equivalents, and Restricted Cash at End of Period 142 87
Supplemental Cash Flow Information:    
Interest, net of amounts capitalized 129 111
Income taxes, net (excludes credit transfers) (1) (1)
Noncash transactions —    
Accrued property additions at end of period 118 104
Right-of-use assets obtained under operating leases 1 60
Return of capital to parent company $ 0 $ 33