Revenues and Accounts Receivable - Agreement Balances (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contract With Customer, Asset And Liability [Line Items]
Other current assets	$ 196	$ 405
Deferred revenue	141	501	$ 354
Crude Oil Sales Agreements Entered Into In Conjunction WIth Storage Arrangements And Future Inventory Exchanges
Contract With Customer, Asset And Liability [Line Items]
Other current assets	0	229
Deferred revenue	$ 0	$ 361