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Fair Value Measurements - Reconciliation of Changes in Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 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 loss included in earnings (112) 0
Settlement (gain) loss 19 (26)
Balance at end of period (102) 66
Change in unrealized gains (losses) relating to assets and liabilities still held at the end of the period $ (93) $ (1)