XML 79 R55.htm IDEA: XBRL DOCUMENT v3.20.4
Revenues and Accounts Receivable - Agreement Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Contract With Customer, Asset And Liability [Line Items]      
Other current assets $ 405 $ 312  
Contract liability, deferred revenue 501 354 $ 338
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 229 142  
Contract liability, deferred revenue $ 361 $ 155