v3.25.2
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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 485 $ 979 $ 502 $ 1,299
Total realized / unrealized gains (losses)        
Included in net income (loss) 95 (185) (35) (491)
Included in Payables related to Regulatory Agreement Units 3 1 3 4
Change in collateral 80 (40) 147 (7)
Purchases, sales, issuances and settlements        
Purchases 36 47 51 84
Sales (2) (39) (5) (83)
Settlements (2) (2) (4) (9)
Transfers into Level 3 (42) 30 (42) 39
Transfers out of Level 3 (11) 14 25 (31)
Ending Balance 642 805 642 805
The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities 207 (4) 112 25
NDT Fund Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 502 460 502 429
Total realized / unrealized gains (losses)        
Included in net income (loss) 1 0 2 0
Included in Payables related to Regulatory Agreement Units 3 1 3 4
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 0 33 0 66
Sales 0 0 0 0
Settlements (2) (2) (4) (7)
Transfers into Level 3 0 0 1 0
Transfers out of Level 3 0 0 0 0
Ending Balance 504 492 504 492
The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities 1 0 2 0
Mark-to-Market Derivatives        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (18) 518 (1) 869
Total realized / unrealized gains (losses)        
Included in net income (loss) 94 (185) (37) (491)
Included in Payables related to Regulatory Agreement Units 0 0 0 0
Change in collateral 80 (40) 147 (7)
Purchases, sales, issuances and settlements        
Purchases 36 14 51 18
Sales (2) (39) (5) (83)
Settlements 0 0 0 (2)
Transfers into Level 3 (42) 30 (43) 39
Transfers out of Level 3 (11) 14 25 (31)
Ending Balance 137 312 137 312
The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities 206 (4) 110 25
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]        
Realized gains (losses) (112) (181) (147) (518)
Rabbi trust investments        
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 Payables related to Regulatory Agreement Units 0 0 0 0
Change in collateral 0 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