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Fair Value of Financial Assets and Liabilities - Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 805	$ 1,073	$ 1,299	$ 643
Total realized / unrealized gains (losses)
Included in net income (loss)	62	(236)	(429)	25
Included in Payable related to Regulatory Agreement Units	9	0	13	4
Change in collateral	(166)	(7)	(173)	99
Purchases, sales, issuances and settlements
Purchases	14	35	98	120
Sales	0	(3)	(83)	(9)
Settlements	(7)	32	(16)	25
Transfers into Level 3	(11)	0	28	59
Transfers out of Level 3	0	(91)	(31)	(163)
Ending Balance	706	803	706	803
The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities	195	54	220	760
NDT Fund Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	492	421	429	423
Total realized / unrealized gains (losses)
Included in net income (loss)	4	0	4	1
Included in Payable related to Regulatory Agreement Units	9	0	13	4
Change in collateral	0	0	0	0
Purchases, sales, issuances and settlements
Purchases	0	0	66	0
Sales	0	0	0	0
Settlements	(7)	0	(14)	(7)
Transfers into Level 3	1	0	1	0
Transfers out of Level 3	0	0	0	0
Ending Balance	499	421	499	421
The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities	4	0	4	1
Mark-to-Market Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	312	651	869	219
Total realized / unrealized gains (losses)
Included in net income (loss)	58	(236)	(433)	24
Included in Payable related to Regulatory Agreement Units	0	0	0	0
Change in collateral	(166)	(7)	(173)	99
Purchases, sales, issuances and settlements
Purchases	14	35	32	120
Sales	0	(3)	(83)	(9)
Settlements	0	32	(2)	32
Transfers into Level 3	(12)	0	27	59
Transfers out of Level 3	0	(91)	(31)	(163)
Ending Balance	206	381	206	381
The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities	191	54	216	759
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Realized gains (losses)	133	258	651	703
Life Insurance Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1	1	1	1
Total realized / unrealized gains (losses)
Included in net income (loss)	0	0	0	0
Included in Payable related to Regulatory Agreement Units	0	0	0	0
Change in collateral		0	0	0
Purchases, sales, issuances and settlements
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending Balance	1	1	1	1
The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities	$ 0	$ 0	$ 0	$ 0

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