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Derivative Financial Instruments, Investments and Fair Value Measurements - Schedule of Gains on Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain on derivatives, net $ 20 $ 4 $ 65 $ 20
Forward purchases and sales contracts, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain on derivatives, net 15 3 51 20
Commodity swap instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain on derivatives, net 4 0 4 0
Futures contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain on derivatives, net $ 1 $ 1 $ 10 $ 0