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Investment in Cenovus Energy (Tables) | 6 Months Ended
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Jun. 30, 2022
Cenovus Energy Inc |
Debt and Equity Securities, FV-NI [Line Items] |
Schedule of Gains and Losses Recorded in Other Income (Loss) |
| Millions of Dollars
| Three Months Ended June 30 | Six Months Ended June 30
| 2022 | 2021 | 2022 | 2021
Total Net gain on equity securities | $ | — |  | 418 |  | 251 |  | 726 |
Less: Net gain on equity securities sold during the period | — |  | 31 |  | 251 |  | 60 |
Unrealized gain on equity securities still held at the reporting date | $ | — |  | 387 |  | $ | — |  | 666 |

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