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Revenues - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Contract With Customer, Asset And Liability [Line Items]    
General payment terms P30D  
Trade accounts receivable arising from revenues from contracts with customers $ 2,721 $ 2,584
Other trade accounts receivables and other receivables 3,763 3,709
Impact due to contractual rights of offset with counterparties (3,660) (3,264)
Trade accounts receivable and other receivables, net 2,824 3,029
Other current assets 358 221
Contract liability, deferred revenue 453 90
Minimum Volume Commitments    
Contract With Customer, Asset And Liability [Line Items]    
Counterparty deficiencies 62 57
Contract liability, deferred revenue 44 37
Counterparty deficiencies unbilled and uncollected 18 $ 20
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 197  
Contract liability, deferred revenue $ 197