Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC - 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
Other, net	51	79
Changes in certain current assets and liabilities —
Receivables	319	(217)
Other current assets	143	8
Accounts payable	(1,056)	132
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)
Other investing activities	(91)	(18)
Net cash used for investing activities	(2,118)	(1,555)
Financing Activities:
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
Reassessment of right-of-use assets under operating leases	0	40
SOUTHERN POWER CO
Operating Activities:
Net income (loss)	39	27
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	133	126
Deferred income taxes	3	12
Amortization of investment tax credits	(15)	(15)
Gain on dispositions, net	(20)	(2)
Other, net	(14)	(3)
Changes in certain current assets and liabilities —
Receivables	120	11
Prepaid income taxes	15	(8)
Other current assets	(13)	0
Accounts payable	(92)	(21)
Accrued compensation	(13)	(13)
Other current liabilities	(8)	3
Net cash provided from operating activities	135	117
Investing Activities:
Property additions	(11)	(19)
Proceeds from dispositions	46	29
Change in construction payables	(15)	(31)
Payments pursuant to LTSAs	(16)	(15)
Other investing activities	0	(1)
Net cash used for investing activities	4	(37)
Financing Activities:
Decrease in notes payable, net	(59)	(3)
Capital contributions from noncontrolling interests	21	73
Distributions to noncontrolling interests	(48)	(97)
Payment of common stock dividends	(63)	(49)
Other financing activities	3	0
Net cash provided from (used for) financing activities	(146)	(76)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(7)	4
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	133	135
Cash, Cash Equivalents, and Restricted Cash at End of Period	126	139
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	30	29
Income taxes, net	(9)	(8)
Noncash transactions —
Noncash transactions — Accrued property additions at end of period	12	46
Reassessment of right-of-use assets under operating leases	$ 0	$ 40