Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income (loss)	$ 3,566	$ 2,592
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	3,084	2,944
Deferred income taxes	608	89
Utilization of federal investment tax credits	266	256
Gain on dispositions, net	(41)	(171)
Other, net	(45)	156
Changes in certain current assets and liabilities —
Receivables	(327)	2
Other current assets	(343)	(180)
Accounts payable	805	(45)
Accrued taxes	167	288
Other current liabilities	(32)	(226)
Net cash provided from operating activities	5,017	5,081
Investing Activities:
Business acquisitions, net of cash acquired	0	(345)
Property additions	(5,502)	(5,222)
Payments pursuant to LTSAs	(121)	(145)
Other investing activities	73	(12)
Net cash used for investing activities	(5,952)	(5,850)
Financing Activities:
Decrease in notes payable, net	(349)	(203)
Capital contributions from noncontrolling interests	73	415
Distributions to noncontrolling interests	(175)	(204)
Payment of common stock dividends	(2,166)	(2,077)
Other financing activities	(235)	(224)
Net cash provided from financing activities	1,119	1,802
Net Change in Cash, Cash Equivalents, and Restricted Cash	184	1,033
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,013	2,101
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,425	1,417
Income taxes, net	160	92
Noncash transactions —
Contributions from noncontrolling interests	0	89
Contributions of wind turbine equipment	0	82
Accrued property additions at year-end	872	915
Reassessment of right-of-use assets under operating leases	40	0
SOUTHERN POWER CO
Operating Activities:
Net income (loss)	210	184
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	404	402
Deferred income taxes	21	(16)
Utilization of federal investment tax credits	218	237
Amortization of investment tax credits	(44)	(44)
Gain on dispositions, net	(2)	(39)
Other, net	1	14
Changes in certain current assets and liabilities —
Receivables	(124)	(117)
Prepaid income taxes	22	63
Other current assets	(15)	(5)
Accounts payable	95	55
Accrued taxes	55	15
Other current liabilities	(14)	1
Net cash provided from operating activities	827	750
Investing Activities:
Business acquisitions, net of cash acquired	0	(345)
Property additions	(64)	(355)
Proceeds from dispositions	48	22
Change in construction payables	(60)	(22)
Payments pursuant to LTSAs	(52)	(61)
Other investing activities	0	8
Net cash used for investing activities	(128)	(753)
Financing Activities:
Decrease in notes payable, net	(5)	(148)
Proceeds — Senior notes	0	400
Redemptions — Senior notes	(677)	0
Capital contributions from parent company	330	4
Return of capital to parent company	0	(271)
Capital contributions from noncontrolling interests	73	415
Distributions to noncontrolling interests	(175)	(204)
Payment of common stock dividends	(148)	(153)
Other financing activities	(1)	(10)
Net cash provided from financing activities	(603)	33
Net Change in Cash, Cash Equivalents, and Restricted Cash	96	30
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	135	183
Cash, Cash Equivalents, and Restricted Cash at End of Period	231	213
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	120	118
Income taxes, net	(202)	(235)
Noncash transactions —
Contributions from noncontrolling interests	0	89
Contributions of wind turbine equipment	0	82
Accrued property additions at year-end	30	53
Right-of-use assets obtained under operating leases	0	66
Reassessment of right-of-use assets under operating leases	$ 40	$ 0