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Suspended Wells and Other Exploration Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Suspended Wells [Abstract]          
Capitalized cost of suspended wells $ 973   $ 973   $ 856
Increase (decrease) in capitalized cost of suspended wells     $ 117    
Number of wells charged to dry hole expense     No    
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]          
Exploration Expense 360 $ 103 $ 592 $ 267  
Central Louisiana Austin Chalk Acreage [Member] | Lower Forty Eight [Member]          
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]          
Exploration Expense 141        
Dry Hole Expense $ 98