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Investment in Cenovus Energy - Narrative (Details) - Common Stock - Cenovus Energy Inc - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |
Shares held (in shares) |  | 91
Investment owned, common stock, percent of issued and outstanding |  | 4.50%
Investment in equity security, fair value |  | $ 1,100
Cenovus Energy common share price |  | $ 12.28
Equity securities, shares sold | 91 |
Proceeds received from sale of equity securities | $ 1,400 |

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