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Investment in Cenovus Energy - Narrative (Details) - Cenovus Energy Inc - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of shares of common stock outstanding (in shares) |  |  | 91
Investment owned, percent of issued and outstanding |  |  | 4.50%
Common stock, outstanding value |  |  | $ 1,100
Share price (in dollars per share) |  |  | $ 12.28
Common Stock |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity securities, shares sold (in shares) | 91 |  |
Proceeds received from sale of equity securities |  | $ 1,400 |

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