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Investment in Cenovus Energy (Details) - USD ($) $ / shares in Units, shares in Millions | 5 Months Ended | 12 Months Ended
--- | --- | ---
May 17, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Investment in Cenovus Energy |  |  | $ 2,111,000,000 | $ 1,462,000,000 |
Unrealized Gain (Loss) on Securities, before tax | [1] |  | 649,000,000 | (437,000,000) | $ 0
Foster Creek Christina Lake (FCCL) [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Ownership percentage in equity investment |  | 50.00% |  |  |
Common Stock [Member] | Cenovus Energy [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Shares Exchanged for Assets Held for Sale |  | 208 |  |  |
Percent of issued and outstanding common shares of Cenovus |  | 16.90% |  |  |
Investment In Equity Security Fair Value |  | $ 1,960,000,000 | $ 2,110,000,000 | $ 1,460,000,000 |
Cenovus Energy common share price |  | $ 9.41 | $ 10.15 |  |
Unrealized Gain (Loss) on Securities, before tax |  |  | $ 649,000,000 |  |
[1] | *See Note 7—Investment in Cenovus Energy, for additional information.

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