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Revenues and Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Contract With Customer, Asset And Liability [Line Items]      
Other current assets $ 312 $ 373  
Contract liability, deferred revenue $ 354 $ 338 $ 90
Substantially all trade accounts receivable, net, maximum age of balances past their scheduled invoice date 30 days 30 days  
Allowance for doubtful accounts receivable $ 3 $ 3  
General payment terms 30 days    
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 $ 142 115  
Contract liability, deferred revenue 155 116  
Minimum Volume Commitments      
Contract With Customer, Asset And Liability [Line Items]      
Contract liability, deferred revenue 22 40  
Counterparty deficiencies 42 62  
Counterparty deficiencies unbilled and uncollected $ 20 $ 22