Revenues and Accounts Receivable - Counterparty Deficiencies (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contract With Customer, Asset And Liability [Line Items]
Contract liability, deferred revenue	$ 141	$ 501	$ 354
Minimum Volume Commitments
Contract With Customer, Asset And Liability [Line Items]
Contract liability, deferred revenue	63	73
Counterparty deficiencies unbilled and uncollected	16	4
Counterparty deficiencies	$ 79	$ 77