Consolidated Statements of Cash Flows - SPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Consolidated net income	$ 3,428	$ 2,309	$ 3,103
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	4,064	3,973	3,905
Deferred income taxes	670	(49)	(241)
Utilization of federal investment tax credits	88	288	341
Amortization of investment tax credits	(83)	(84)	(84)
Gain on dispositions, net	(42)	(176)	(66)
Other, net	17	87	(75)
Changes in certain current assets and liabilities —
-Receivables	(769)	(81)	(222)
-Other current assets	(288)	(270)	(132)
-Other current liabilities	153	(204)	173
Net cash provided from operating activities	6,302	6,169	6,696
Investing Activities:
Property additions	(7,923)	(7,586)	(7,522)
Proceeds from dispositions	275	917	1,049
Payments pursuant to LTSAs	(190)	(188)	(211)
Other investing activities	70	(49)	21
Net cash used for investing activities	(8,430)	(7,353)	(7,030)
Financing Activities:
Increase (decrease) in notes payable, net		530
Increase (decrease) in notes payable, net	(337)		(1,096)
Redemptions and repurchases —
Short-term borrowings	(1,150)	(25)	(840)
Capital contributions from noncontrolling interests	73	501	363
Distributions to noncontrolling interests	(259)	(351)	(271)
Payment of common stock dividends	(2,907)	(2,777)	(2,685)
Other financing activities	(218)	(266)	(325)
Net cash provided from (used for) financing activities	2,336	1,945	(576)
Net Change in Cash, Cash Equivalents, and Restricted Cash	208	761	(910)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	1,829	1,068	1,978
Cash, Cash Equivalents, and Restricted Cash at End of Year	2,037	1,829	1,068
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,758	1,718	1,683
Income taxes, net	146	93	64
Noncash transactions —
Accrued property additions at year-end	1,024	866	989
Contributions from noncontrolling interests	15	89	12
Contributions of wind turbine equipment	0	82	17
Southern Power
Operating Activities:
Consolidated net income	247	167	207
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	543	542	519
Deferred income taxes	9	55	(25)
Utilization of federal investment tax credits	49	288	340
Amortization of investment tax credits	(58)	(58)	(59)
Income taxes receivable, non-current	1	5	(20)
Gain on dispositions, net	(2)	(41)	(39)
Loss on sales-type leases	1	40	0
Other, net	17	(6)	(5)
Changes in certain current assets and liabilities —
-Receivables	(82)	(44)	(4)
-Prepaid income taxes	22	(16)	20
-Other current assets	(11)	(14)	(30)
-Other current liabilities	79	33	(3)
Net cash provided from operating activities	815	951	901
Investing Activities:
Acquisitions, net of cash acquired	0	(345)	(81)
Property additions	(100)	(396)	(223)
Change in construction payables	(69)	(15)	31
Proceeds from dispositions	48	24	666
Payments pursuant to LTSAs	(71)	(82)	(76)
Other investing activities	(2)	11	57
Net cash used for investing activities	(194)	(803)	374
Financing Activities:
Increase (decrease) in notes payable, net	10	36
Increase (decrease) in notes payable, net			(274)
Proceeds —
Senior notes	0	400	0
Redemptions and repurchases —
Senior notes	(677)	(300)	(825)
Short-term borrowings	0	0	(100)
Capital contributions from parent company	430	8	6
Return of capital to parent company	0	(271)	0
Capital contributions from noncontrolling interests	73	501	363
Distributions to noncontrolling interests	(259)	(351)	(271)
Purchase of membership interests from noncontrolling interests	0	0	(60)
Payment of common stock dividends	(198)	(204)	(201)
Other financing activities	(2)	(14)	(10)
Net cash provided from (used for) financing activities	(623)	(195)	(1,372)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(2)	(47)	(97)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	135	182	279
Cash, Cash Equivalents, and Restricted Cash at End of Year	133	135	182
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	142	140	147
Income taxes, net	(15)	(275)	(283)
Noncash transactions —
Accrued property additions at year-end	24	72	89
Contributions from noncontrolling interests	15	89	12
Contributions of wind turbine equipment	$ 0	$ 82	$ 17