Derivatives - Gains and Losses on Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instrument	$ (26)	$ 88	$ 150	$ (573)
Collars and Call Options | Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instrument	(101)	110	(339)	1,067
Marketing Derivatives | Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instrument	12	(18)	214	0
Interest Rate Swaps | Gains (losses) on interest rate swaps and warrants, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instrument	$ (26)	$ 88	$ 150	$ (577)