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Derivative Financial Instruments, Investments and Fair Value Measurements - Schedule of Gains (Losses) on Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Total gain (loss) on derivatives, net $ 55 $ 19 $ 146
Forward purchases and sales contracts, net      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gain (loss) on derivatives, net 53 20 103
Commodity swap instruments      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gain (loss) on derivatives, net (8) 0 44
Futures contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Total gain (loss) on derivatives, net $ 10 $ (1) $ (1)