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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain on derivatives, net	$ (2)	$ 20	$ (34)	$ 65
Forward purchases and sales contracts, net
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain on derivatives, net	4	15	22	51
Commodity swap instruments
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain on derivatives, net	(5)	4	(55)	4
Futures contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total (loss) gain on derivatives, net	$ (1)	$ 1	$ (1)	$ 10