Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 2,874	$ 2,455	$ 3,579
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	6,084	5,843	5,663
Equity in (earnings) losses of unconsolidated affiliates	(98)	(114)	(28)
Losses on sales of Commercial Renewables Disposal Groups	1,725	1,748	0
Equity component of AFUDC	(198)	(197)	(171)
Impairment of assets and other charges	85	434	356
Deferred income taxes	3	(200)	191
Contributions to qualified pension plans	(100)	(58)
Payments for asset retirement obligations	(632)	(584)	(540)
Provision for rate refunds	(63)	(130)	(70)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(18)	19	50
Receivables	443	(788)	(297)
Inventory	(706)	(476)	(34)
Other current assets	(267)	(1,498)	(1,136)
Increase (decrease) in
Accounts payable	(800)	805	249
Taxes accrued	126	10	284
Other current liabilities	(26)	(153)	(13)
Other assets	914	(1,577)	125
Other liabilities	584	410	95
Net cash provided by operating activities	9,878	5,927	8,290
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(12,604)	(11,367)	(9,715)
Contributions to equity method investments	(34)	(58)	(81)
Return of investment capital	16	6	44
Purchases of debt and equity securities	(3,761)	(4,243)	(6,098)
Proceeds from sales and maturities of debt and equity securities	3,824	4,333	6,103
Proceeds from the sales of other assets	149	83	0
Proceeds from the sales of Commercial Renewables Disposal Groups, net of cash divested	734	0	0
Disbursements to canceled equity method investments			(855)
Other	(799)	(727)	(333)
Net cash used in investing activities	(12,475)	(11,973)	(10,935)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	10,028	11,874	9,052
Proceeds from the issuance of common stock	8	9	5
Payments for the redemption of long-term debt	(4,737)	(4,396)	(5,294)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	610	80	332
Payments for the redemption of short-term debt with original maturities greater than 90 days	(125)	(287)	(997)
Notes payable and commercial paper	(343)	781	1,144
Contributions from noncontrolling interests	278	1,377	1,575
Dividends paid	(3,244)	(3,179)	(3,114)
Other	(124)	(130)	(94)
Net cash provided by financing activities	2,351	6,129	2,609
Net (decrease) increase in cash, cash equivalents and restricted cash	(246)	83	(36)
Cash, cash equivalents and restricted cash at beginning of period	603	520	556
Cash, cash equivalents and restricted cash at end of period	357	603	520
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	2,883	2,361	2,248
Cash paid for (received from) income taxes	1	(6)	(3)
Significant non-cash transactions:
Accrued capital expenditures	$ 1,908	$ 1,766	$ 1,325