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Fair Value of Financial Instruments - Reconciliation of Level 3 Financial Instruments (Details) - Level 3 - Derivatives - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 91 $ 471 $ 119 $ 505
Total gains/(losses) realized/unrealized included in earnings 4 (86) (37) (177)
Purchases 31 99 31 140
Transfers into Level 3 2 414 17 438
Transfers out of Level 3 (7) 7 (9) (1)
Ending balance 121 905 121 905
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end $ 8 $ (76) $ (29) $ (131)