Condensed Statements of Cash Flows (Unaudited) - APC - 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
Pension, postretirement, and other employee benefits	(126)	(123)
Settlement of asset retirement obligations	(113)	(87)
Other, net	51	79
Changes in certain current assets and liabilities —
Receivables	319	(217)
Fossil fuel stock	(203)	39
Prepayments	(100)	(86)
Other current assets	143	8
Accounts payable	(1,056)	132
Accrued taxes	(237)	(58)
Accrued compensation	(478)	(470)
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
Cost of removal, net of salvage	(135)	(227)
Change in construction payables, net	(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
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 finance leases	1	0
Alabama Power
Operating Activities:
Net income (loss)	255	351
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	398	250
Deferred income taxes	(75)	35
Pension, postretirement, and other employee benefits	(51)	(48)
Settlement of asset retirement obligations	(52)	(38)
Retail fuel cost under recovery – long-term	100	(46)
Other, net	(3)	(27)
Changes in certain current assets and liabilities —
Receivables	90	(4)
Fossil fuel stock	(78)	23
Prepayments	(89)	(85)
Other current assets	(37)	(10)
Accounts payable	(400)	(237)
Accrued taxes	109	102
Accrued compensation	(102)	(99)
Other current liabilities	(35)	(13)
Net cash provided from operating activities	30	154
Investing Activities:
Property additions	(389)	(343)
Nuclear decommissioning trust fund purchases	(87)	(72)
Nuclear decommissioning trust fund sales	87	72
Cost of removal, net of salvage	(41)	(60)
Change in construction payables, net	(70)	39
Other investing activities	(9)	(1)
Net cash used for investing activities	(509)	(365)
Financing Activities:
Increase in notes payable, net	170	0
Proceeds — Senior notes	0	700
Other long-term debt	16	0
Senior notes	0	(550)
Capital contributions from parent company	325	625
Payment of common stock dividends	(285)	(254)
Other financing activities	(7)	(17)
Net cash provided from (used for) financing activities	219	504
Net Change in Cash, Cash Equivalents, and Restricted Cash	(260)	293
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	687	1,060
Cash, Cash Equivalents, and Restricted Cash at End of Period	427	1,353
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	138	110
Noncash transactions —
Noncash transactions — Accrued property additions at end of period	111	188
Right-of-use assets obtained under operating leases	13	1
Right-of-use assets obtained under finance leases	$ 1	$ 0