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Assets Held for Sale or Sold (Details) - Operating Segments [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Lower 48 Segment | 2018 Q3 Undeveloped Acreage Exchanged                  
Long Lived Assets Held For Sale [Line Items]                  
Gain (Loss) on Sale of Oil and Gas Property     $ 56            
Barnett [Member] | Lower 48 Segment                  
Long Lived Assets Held For Sale [Line Items]                  
Net carrying value     201       $ 201    
Impairment of AHFS     43   $ 44     $ 568  
Fair Value - Net PP&E (held for sale)         250        
Amount of PP&E in carrying value of assets     250       250    
Pretax operating Income (Loss) on AHFS             (59) (575)  
Barnett [Member] | Lower 48 Segment | Scenario Plan [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Proceeds from asset dispositions     230            
Barnett [Member] | Lower 48 Segment | Asset Retirement Obligation Costs [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Liabilities of AHFS     49       $ 49    
2018 Q1 Certain properties sold. | Lower 48 Segment                  
Long Lived Assets Held For Sale [Line Items]                  
Proceeds from asset dispositions         112        
Gain (Loss) on Sale of Oil and Gas Property         $ 0        
2018 Q2 undeveloped acreage sold [Member] | Lower 48 Segment                  
Long Lived Assets Held For Sale [Line Items]                  
Proceeds from asset dispositions       $ 105          
Gain (Loss) on Sale of Oil and Gas Property       0          
Foster Creek Christina Lake (FCCL) and western Canada gas properties [Member] | Canada                  
Long Lived Assets Held For Sale [Line Items]                  
Cenovus Contingent Payment Trigger             The contingent payment, calculated on a quarterly basis, is $6 million Canadian dollars (CAD) for every $1 CAD by which the Western Canada Select quarterly average crude price exceeds $52 CAD per barrel.    
Gain (Loss) on Sale of Oil and Gas Property     45 $ 50          
Clair Field [Member] | Europe and North Africa Segment [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Net carrying value     945       $ 945    
Amount of PP&E in carrying value of assets     1,552       1,552    
Amount of deferred taxes in carrying value of asset     544       544    
Pretax operating Income (Loss) on AHFS             13 $ 1  
Clair Field [Member] | Europe and North Africa Segment [Member] | Scenario Plan [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Percent Sold   16.50%              
Percent Retained   7.50%              
Clair Field [Member] | Europe and North Africa Segment [Member] | Minimum [Member] | Scenario Plan [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Non Cash Gain (Loss) On Sale   $ 500              
Clair Field [Member] | Europe and North Africa Segment [Member] | Maximum [Member] | Scenario Plan [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Non Cash Gain (Loss) On Sale   $ 1,000              
Clair Field [Member] | Europe and North Africa Segment [Member] | Asset Retirement Obligation Costs [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Liabilities of AHFS     $ 63       $ 63    
San Juan Basin [Member] | Lower 48 Segment                  
Long Lived Assets Held For Sale [Line Items]                  
San Juan Contingent Trigger     The transaction includes a contingent payment of up to $300 million.            
Proceeds from asset dispositions           $ 2,500      
Gain (Loss) on Sale of Oil and Gas Property           $ (22)      
Greater Sunrise Fields [Member] | Asia Pacific and Middle East Segment [Member] | Scenario Plan [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Proceeds from asset dispositions $ 350                
Investment Owned, Percent of Net Assets                 30.00%