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Sales and Other Operating Revenues (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Accounts receivable $ 3,237 $ 6,902
Receivables from contracts with customers 376 336
Contract with customer, liability 0 $ 0
Minimum Volume Commitment Contracts    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Remaining performance obligations $ 0  
Minimum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Customer contracts, term 5 years  
Maximum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Customer contracts, term 15 years