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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
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ (44) $ (13)
Settlements (1) 0
(Losses) gains recognized in earnings [1] 7 (1)
Ending Balance (38) (14)
Transfers Level 3, Net $ 0 $ 0
[1] Level 3 gains recognized in earnings are subject to offsetting losses of derivative instruments categorized as level 1 and 2 in the income statement.