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Derivative Financial Instruments, Investments and Fair Value Measurements - Schedule of Gain (Loss) on Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Total (loss) gain on derivatives, net $ (32) $ 46
Forward purchases and sales contracts, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (loss) gain on derivatives, net 18 36
Commodity swap instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (loss) gain on derivatives, net (50) 0
Futures contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (loss) gain on derivatives, net $ 0 $ 10