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Commitments and Contingencies - Narrative (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Aug. 31, 2022 | Jun. 13, 2022 | Dec. 31, 2021
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Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |
Contractual commitments | $ 32,998 |  |  | $ 34,846
Outstanding letters of credit | 490 |  |  | 565
HMLP |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |
Contractual commitments | 2,200 |  |  | 2,600
Sunrise Oil Sands Partnership |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |
Contingent liabilities recognised in business combination | $ 419 |  |  | $ 0
Initial Recognition |  | $ 600 | $ 600 |

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