v3.19.3.a.u2
Suspended Wells-Exploration Expense (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2019
Dec. 31, 2018
[1]
Dec. 31, 2017
[1]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Exploration Expense   $ 743 $ 369 $ 934
Lower 48 Segment [Member] | Central Louisiana Austin Chalk [Member]        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Exploration Expense   111    
Lower 48 Segment [Member] | Operating Segments [Member] | Central Louisiana Austin Chalk [Member]        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Exploration Expense   $ 141    
Angola | Other International Segment [Member] | Athena Drilling Rig [Member]        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Exploration Expense $ 43      
[1]
See Notes to Consolidated Financial Statements.