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Fair Value of Financial Assets and Liabilities - Changes in Level 3 Commodity Derivatives (Details) - Commodity Contract - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ (38) $ (15) $ (44) $ (13)
Settlements 0 0 (1) (1)
(Losses) gains recognized in earnings [1] (23) (2) (16) (3)
Ending Balance (61) (17) (61) (17)
Transfers Level 3, Net $ 0 $ 0 $ 0 $ 0
[1] Presented amounts relate to instruments held at the end of the period. The consolidated income statement also includes gains and losses on Level 1 and 2 instruments, and Level 3 instruments settled during the period.