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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ (61) $ (17) $ (44) $ (13)
Settlements 4 1 3 0
(Losses) gains recognized in earnings [1] (11) (22) (27) (25)
Ending Balance (68) (38) (68) (38)
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.