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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, 2023
Mar. 31, 2022
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 $ 146 $ (152)
Total gain (loss) included in earnings 138 (391)
Settlement (gain) loss (100) 171
Transfers in and/or out of Level 3 0 0
Balance at end of period 184 (372)
Change in unrealized gains (losses) relating to assets and liabilities still held at the end of the period $ 95 $ (291)
Fair Value Recurring Basis Unobservable Input Reconciliation Net Derivative Asset Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag Total gain (loss) included in earnings Total gain (loss) included in earnings