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Fair Value Measurements - Reconciliation of Changes in Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy    
Balance at beginning of period $ (9) $ 92
Total gain included in earnings 140 48
Settlement gain (37) (90)
Balance at end of period 94 50
Change in unrealized gains relating to assets and liabilities still held at the end of the period $ 95 $ 30