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Investment in Cenovus Energy - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain on investment in Cenovus Energy | $ 0 | $ 251
Cenovus Energy Inc |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain on investment in Cenovus Energy |  | $ 251
Common Stock | Cenovus Energy Inc |  |
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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