v3.19.3.a.u2
Impairments Narratives (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges $ 405 $ 27 $ 6,601
Exploration Expense 743 369 [1] 934 [1]
Alaska Segment [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges 0 20 180
Alaska Segment [Member] | Small interest Point Thomson Unit | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges     180
Alaska Segment [Member] | Cancelled Project [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges   20  
Lower 48 Segment [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges 402 63 3,969
Lower 48 Segment [Member] | Niobrara [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges 402    
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] | Central Louisiana Austin Chalk [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Exploration Expense 141    
Lower 48 Segment [Member] | Barnett [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges   63  
Lower 48 Segment [Member] | Certain Developed Properties [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges     3,969
Lower 48 Segment [Member] | Shenandoah Leasehold [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Exploration Expense     51
Lower 48 Segment [Member] | Mineral Assets [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Exploration Expense     38
Canada Segment [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges 2 9 22
Canada Segment [Member] | Cancelled Project [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges     22
Europe and North Africa Segment [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges 1 (79) 46
Europe and North Africa Segment [Member] | Certain Projects In Europe And NorthAfrica [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges   (79) 46
Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges $ 0 $ 14 2,384
Asia Pacific and Middle East Segment [Member] | Australia Pacific LNG [Member] | Operating Segments [Member]      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Asset Impairment Charges     $ 2,384
[1]
See Notes to Consolidated Financial Statements.