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Investment in Cenovus Energy - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 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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