Derivatives and Financial Instruments - Summary of Commodity Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Liabilities	$ (779)	$ (669)
Effect of Collateral Netting	0	0
Liabilities
Assets	779	669
Effect of Collateral Netting	49	46
Not Designated as Hedging Instrument | Commodity Derivatives
Liabilities
Effect of Collateral Netting	49	46
Total
Assets	860	683
Liabilities	(877)	(725)
Net Carrying Value Presented on the Balance Sheet	32	4
Not Designated as Hedging Instrument | Commodity Derivatives | Prepaid expenses and other current assets
Assets
Assets	99	13
Liabilities	(20)	0
Effect of Collateral Netting	0	0
Net Carrying Value Presented on the Balance Sheet	79	13
Not Designated as Hedging Instrument | Commodity Derivatives | Other assets
Assets
Assets	3	5
Liabilities	(1)	(4)
Effect of Collateral Netting	0	0
Net Carrying Value Presented on the Balance Sheet	2	1
Not Designated as Hedging Instrument | Commodity Derivatives | Other accruals
Liabilities
Assets	758	665
Liabilities	(855)	(721)
Effect of Collateral Netting	49	46
Net Carrying Value Presented on the Balance Sheet	(48)	(10)
Not Designated as Hedging Instrument | Commodity Derivatives | Other liabilities and deferred credits
Liabilities
Assets	0	0
Liabilities	(1)	0
Effect of Collateral Netting	0	0
Net Carrying Value Presented on the Balance Sheet	$ (1)	$ 0