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Investment in Cenovus Energy - Textual (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | May 17, 2017
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Investment in Cenovus Energy | $ 809 |  | $ 809 |  | $ 2,111 |
Unrealized (gain) loss on investment in Cenovus Energy |  |  | $ 1,302 | $ (489) |  |
Foster Creek Christina Lake (FCCL) [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 50.00%
Cenovus Energy Common Stock [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Shares Exchange for Assets Held for Sale | 208 |  | 208 |  |  | 208
Investment Owned, Common Stock, percent of Issued and Outstanding |  |  |  |  |  | 16.90%
Investment in Cenovus Energy | $ 809 |  | $ 809 |  | $ 2,110 | $ 1,960
Unrealized (gain) loss on investment in Cenovus Energy | $ 162 | $ (116) | $ 1,300 | $ (489) |  |
Cenovus Energy Common Stock [Member] | Cenovus Energy Inc [Member] |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |
Cenovus Energy common share price | $ 3.89 |  | $ 3.89 |  |  | $ 9.41

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