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Fair Value Measurement - FV of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Carrying Amount [Member]    
Financial Assets [Abstract]    
Investment in Cenovus Energy $ 1,835 $ 1,462
Total loans and advances - related parties 405 468
Financial Liabilities [Abstract]    
Total debt, excluding capital leases 14,183 14,191
Carrying Amount [Member] | Commodity Contract [Member]    
Financial Assets [Abstract]    
Commodity derivatives, assets 110 170
Financial Liabilities [Abstract]    
Commodity derivatives, liability 84 110
Investment in Cenovus Energy 1,835 1,462
Total loans and advances - related parties 405 468
Total debt, excluding capital leases 17,770 16,147
Commodity Contract [Member]    
Financial Assets [Abstract]    
Commodity derivatives, assets 110 170
Financial Liabilities [Abstract]    
Commodity derivatives, liability $ 84 $ 110