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Investment in Cenovus Energy (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 28, 2019
Mar. 31, 2019
Dec. 31, 2018
May 17, 2017
Schedule Of Available For Sale Securities [Line Items]            
Investment in Cenovus Energy $ 1,835 $ 1,835     $ 1,462  
Foster Creek Christina Lake (FCCL) [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Equity Method Investment, Ownership Percentage           50.00%
Common Stock [Member] | Cenovus Energy [Member]            
Schedule Of Available For Sale Securities [Line Items]            
Shares Exchange for Assets Held for Sale           208
Investment Owned, Common Stock, percent of Issued and Outstanding           16.90%
Investment in Cenovus Energy           $ 1,960
Investment In Equity Securities Fair Value 1,840 1,840   $ 1,810 $ 1,460 $ 1,960
Investment Owned, Common Stock, price per share     $ 8.82     $ 9.41
Unrealized Gain (Loss) on Securities $ 30 $ 373