Condensed Consolidated Statements of Cash Flows (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net income (loss)	$ 1,071	$ 799
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,261	1,233
Allowance for equity funds used during construction	(58)	(65)
Pension, postretirement, and other employee benefits	(129)	(126)
Settlement of asset retirement obligations	(132)	(113)
Stock based compensation expense	83	92
Retail fuel cost under recovery – long-term	0	454
Other, net	76	51
Changes in certain current assets and liabilities —
Receivables	52	790
Retail fuel cost under recovery	257	(470)
Prepayments	(83)	(100)
Fossil fuel stock	(52)	(203)
Materials and supplies	(75)	(98)
Natural gas for sale, net of temporary LIFO liquidation	237	267
Natural gas cost under recovery	0	108
Other current assets	(27)	34
Accounts payable	(423)	(1,056)
Accrued taxes	(226)	(237)
Accrued compensation	(488)	(478)
Accrued interest	(70)	(127)
Customer refunds	(1)	(103)
Natural gas cost over recovery	(65)	117
Other current liabilities	103	75
Net cash provided from operating activities	1,311	844
Investing Activities:
Property additions	(1,770)	(1,850)
Nuclear decommissioning trust fund purchases	(404)	(256)
Nuclear decommissioning trust fund sales	403	251
Proceeds from dispositions	0	103
Cost of removal, net of salvage	(138)	(135)
Construction payables	(365)	(140)
Other investing activities	(111)	(91)
Net cash used for investing activities	(2,385)	(2,118)
Financing Activities:
Increase in notes payable, net	236	187
Proceeds —
Long-term debt	2,359	1,979
Short-term borrowings	450	100
Common stock	28	15
Redemptions and repurchases —
Long-term debt	(656)	(575)
Short-term borrowings	(550)	(400)
Capital contributions from noncontrolling interests	9	21
Distributions to noncontrolling interests	(34)	(48)
Payment of common stock dividends	(733)	(742)
Other financing activities	(124)	(83)
Net cash provided from financing activities	985	454
Net Change in Cash, Cash Equivalents, and Restricted Cash	(89)	(820)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	921	2,037
Cash, Cash Equivalents, and Restricted Cash at End of Period	832	1,217
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	714	652
Income taxes, net	(9)	(9)
Noncash transactions —
Accrued property additions at end of period	580	833
Right-of-use assets obtained under operating leases	14	26
Right-of-use assets obtained under finance leases	0	1
Issuance of common stock under dividend reinvestment plan	$ 33	$ 0