Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net Income		$ 1,083	$ 903	$ 1,371
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization		1,468	1,459	1,443
Nuclear fuel amortization		42	58	37
Allowance for equity funds used during construction		(29)	(27)	(25)
Deferred income taxes		44	(32)	407
Equity (earnings) losses of equity method investees		14	(97)	(132)
Dividends from equity method investees		4	79	142
Loss on extinguishment of debt		0	393	6
Asset (gains) losses and impairments, net		(5)	50	47
Changes in assets and liabilities:
Accounts receivable, net		(352)	(146)	111
Inventories		(98)	(153)	45
Prepaid postretirement benefit costs		107	(117)	(107)
Accounts payable		109	308	0
Accrued pension liability		39	(458)	(11)
Accrued postretirement liability		(71)	(49)	22
Derivative assets and liabilities		65	187	(23)
Regulatory assets and liabilities		(766)	862	104
Other current and noncurrent assets and liabilities		323	(153)	260
Net cash from operating activities		1,977	3,067	3,697
Investing Activities
Plant and equipment expenditures — utility		(3,311)	(3,633)	(3,241)
Plant and equipment expenditures — non-utility		(67)	(139)	(616)
Acquisitions related to business combinations, net of cash acquired		0	0	(126)
Proceeds from sale of assets		24	3	13
Proceeds from sale of nuclear decommissioning trust fund assets		879	1,047	2,350
Investment in nuclear decommissioning trust funds		(878)	(1,046)	(2,350)
Distributions from equity method investees		16	18	24
Contributions to equity method investees		(13)	(8)	(37)
Notes receivable		(30)	(74)	(85)
Other		(51)	(31)	(2)
Net cash used for investing activities		(3,431)	(3,863)	(4,070)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs		2,171	4,457	3,692
Redemption of long-term debt		(1,587)	(3,522)	(882)
Short-term borrowings, net		404	720
Short-term borrowings, net				(790)
Issuance of common stock		1,300	0	2
Repurchase of common stock		(55)	(66)	0
Dividends paid on common stock		(685)	(791)	(760)
Contributions from noncontrolling interests		3	44	36
Distributions to noncontrolling interests		(7)	(45)	(39)
Acquisition related deferred payment, excluding accretion		0	0	(380)
Prepayment costs for extinguishment of long-term debt		0	(361)	0
Transfer of cash to DT Midstream at separation		0	(37)	0
Other		(82)	(84)	(83)
Net cash from financing activities		1,462	315	796
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		8	(481)	423
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		35	516	93
Cash, Cash Equivalents, and Restricted Cash at End of Period		43	35	516
Supplemental disclosure of cash information
Cash paid (received) for: Interest, net of interest capitalized		638	671	679
Cash paid (received) for: Income taxes	[1]	(3)	(3)	(360)
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable		435	353	266
Separation of DT Midstream net assets, excluding cash transferred		$ 0	$ 3,973	$ 0

[1] 2020 cash received primarily relates to AMT credit and other refunds, of which a portion was accelerated due to the CARES Act