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Derivative Financial Instruments and Fair Value Measurements - Schedule of Gains (Losses) on Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on derivatives, net	$ 18	$ 5	$ 38	$ 75
Forward purchases and sales, net
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on derivatives, net	17	4	37	33
Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on derivatives, net	0	0	0	43
Futures
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on derivatives, net	$ 1	$ 1	$ 1	$ (1)