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Fair Value Measurements - Reconciliation of Changes in Fair Value of Level 3 Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ (75) $ (28) $ (99) $ 6
Total realized and unrealized loss included in earnings (65) (131) (92) (141)
Settlements 38 57 100 33
Transfer into Level 3     (11) 0
Ending balance (102) (102) (102) (102)
Unrealized gain (loss) included in earnings $ (27) $ (74) $ 8 $ (108)