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Dispositions - Canadian Business - Discontinued Operations (Details)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2017
USD ($)
notes_receivable
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
notes_receivable
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from sale of oil and gas property and equipment           $ 1,249 $ 1,757  
Impairments   $ 8 $ 201     50 205  
Net loss on disposal of assets   (16) (19)     (323) (26)  
Canadian Business                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Impairments         $ 6,600      
Impairments, net of tax         $ 4,960      
Canadian Business | Discontinued Operations, Disposed of by Sale                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Consideration received on disposition $ 2,500              
Proceeds from sale of oil and gas property and equipment $ 1,800              
Number of notes receivable | notes_receivable 2             2
Impairments   0 0     0 6,636  
Net loss on disposal of assets   $ 0 $ 0 $ 43   $ 0 $ 43  
Variable Interest Entity, Not Primary Beneficiary | Canadian Business | Discontinued Operations, Disposed of by Sale                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Variable interest entity, ownership percentage 20.00%              
Notes Receivable [Member] | Canadian Business | Discontinued Operations, Disposed of by Sale                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Notes receivable $ 750