Condensed Consolidated Statements of Cash Flows (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net income (loss)	$ 799	$ 991
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,233	989
Allowance for equity funds used during construction	(65)	(51)
Pension, postretirement, and other employee benefits	(126)	(123)
Settlement of asset retirement obligations	(113)	(87)
Stock based compensation expense	92	85
Natural gas cost under recovery – long-term	0	162
Retail fuel cost under recovery – long-term	454	(130)
Other, net	51	79
Changes in certain current assets and liabilities —
Receivables	319	(217)
Prepayments	(100)	(86)
Fossil fuel stock	(203)	39
Materials and supplies	(98)	(28)
Natural gas for sale, net of temporary LIFO liquidation	267	450
Other current assets	143	8
Accounts payable	(1,056)	132
Accrued taxes	(237)	(58)
Accrued compensation	(478)	(470)
Accrued interest	(127)	(128)
Natural gas cost over recovery	117	0
Other current liabilities	(28)	35
Net cash provided from operating activities	844	1,592
Investing Activities:
Property additions	(1,850)	(1,419)
Nuclear decommissioning trust fund purchases	(256)	(294)
Nuclear decommissioning trust fund sales	251	289
Proceeds from dispositions	103	91
Cost of removal, net of salvage	(135)	(227)
Construction payables	(140)	23
Other investing activities	(91)	(18)
Net cash used for investing activities	(2,118)	(1,555)
Financing Activities:
Increase in notes payable, net	187	137
Proceeds —
Long-term debt	1,979	700
Short-term borrowings	100	850
Common stock	15	38
Redemptions and repurchases —
Long-term debt	(575)	(977)
Short-term borrowings	(400)	(100)
Capital contributions from noncontrolling interests	21	73
Distributions to noncontrolling interests	(48)	(97)
Payment of common stock dividends	(742)	(702)
Other financing activities	(83)	(115)
Net cash provided from (used for) financing activities	454	(193)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(820)	(156)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,217	1,673
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	652	515
Income taxes, net	(9)	(8)
Noncash transactions —
Noncash transactions — Accrued property additions at end of period	833	863
Right-of-use assets obtained under operating leases	26	3
Right-of-use assets obtained under finance leases	1	0
Reassessment of right-of-use assets under operating leases	$ 0	$ 40