Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income (loss)	$ 2,079	$ 1,482
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,995	1,949
Deferred income taxes	240	(101)
Utilization of federal investment tax credits	281	224
Other, net	21	117
Changes in certain current assets and liabilities —
Receivables	(637)	29
Other current assets	12	94
Accounts payable	703	(177)
Accrued taxes	(150)	(157)
Other current liabilities	30	(235)
Net cash provided from operating activities	3,579	2,904
Investing Activities:
Business acquisitions, net of cash acquired	0	(345)
Property additions	(3,213)	(3,384)
Payments pursuant to LTSAs	(81)	(114)
Other investing activities	96	(20)
Net cash used for investing activities	(3,460)	(4,026)
Financing Activities:
Increase (decrease) in notes payable, net	263	492
Proceeds —
Capital contributions from noncontrolling interests	73	343
Distributions to noncontrolling interests	(115)	(113)
Payment of common stock dividends	(1,425)	(1,377)
Other financing activities	(219)	(167)
Net cash provided from (used for) financing activities	(213)	1,671
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	549
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,735	1,617
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	836	884
Income taxes, net	157	88
Noncash transactions —
Contributions from noncontrolling interests	0	89
Contributions of wind turbine equipment	0	82
Accrued property additions at year-end	837	943
Reassessment of right-of-use assets under operating leases	40	0
SOUTHERN POWER CO
Operating Activities:
Net income (loss)	103	100
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	264	264
Deferred income taxes	14	(20)
Utilization of federal investment tax credits	239	205
Amortization of investment tax credits	(29)	(29)
Gain on dispositions, net	(2)	(39)
Other, net	(25)	(18)
Changes in certain current assets and liabilities —
Receivables	(161)	(91)
Prepaid income taxes	22	28
Other current assets	(6)	2
Accounts payable	114	14
Accrued taxes	42	8
Other current liabilities	(23)	(13)
Net cash provided from operating activities	552	411
Investing Activities:
Business acquisitions, net of cash acquired	0	(345)
Property additions	(34)	(224)
Proceeds from dispositions	48	17
Change in construction payables	(54)	(14)
Payments pursuant to LTSAs	(33)	(47)
Other investing activities	0	12
Net cash used for investing activities	(73)	(601)
Financing Activities:
Increase (decrease) in notes payable, net	94
Increase (decrease) in notes payable, net		(56)
Proceeds —
Senior notes	0	400
Capital contributions from parent company	326	4
Redemptions — Senior notes	(677)	0
Return of capital to parent company	0	(271)
Capital contributions from noncontrolling interests	73	343
Distributions to noncontrolling interests	(115)	(113)
Payment of common stock dividends	(99)	(102)
Other financing activities	(5)	(9)
Net cash provided from (used for) financing activities	(403)	196
Net Change in Cash, Cash Equivalents, and Restricted Cash	76	6
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	135	183
Cash, Cash Equivalents, and Restricted Cash at End of Period	211	189
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	91	91
Income taxes, net	(263)	(189)
Noncash transactions —
Contributions from noncontrolling interests	0	89
Contributions of wind turbine equipment	0	82
Accrued property additions at year-end	28	59
Right-of-use assets obtained under operating leases	0	65
Reassessment of right-of-use assets under operating leases	$ 40	$ 0