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Supplemental Information To Statements Of Cash Flows (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Jan. 07, 2021
Dec. 31, 2020
Supplemental Cash Flow [Line Items]      
Accrued capital expenditures     $ 100
Total Property And Equipment Net And Accounts Payable Member      
Supplemental Cash Flow [Line Items]      
Accrued capital expenditures $ 200    
Accounts Payable Member | WPX      
Supplemental Cash Flow [Line Items]      
Accrued capital expenditures   $ 150