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Commitments and Contingencies - Narrative (Details) $ in Millions | May 17, 2021 $ / bbl | May 17, 2017 $ / bbl | Sep. 30, 2021 CAD ($) | Jan. 01, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
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Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Total Payments |  |  | $ 33,343 |  |
Transportation and Storage |  |  | 29,386 |  |
Outstanding letters of credit |  |  | 507 |  | $ 441
Contingent liabilities recognised in business combination |  |  | 392 |  | 63
Commitments approved and not yet in service |  |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Transportation and Storage |  |  | 8,100 |  | 14,000
Arrangement |  |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Total Payments |  |  |  | $ 17,600 |
Transportation and Storage |  |  |  | 7,400 |
Arrangement | Commitments approved and not yet in service |  |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Transportation and Storage |  |  |  | $ 1,700 |
Keystone XL Pipeline |  |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Transportation and Storage |  |  |  |  | 7,000
HMLP |  |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Total Payments |  |  |  |  | $ 2,700
Conoco Phillips Company and certain of its subsidiaries |  |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Average crude oil price | $ / bbl | 52.00 |  |  |  |
Contingent liabilities recognised in business combination |  |  | $ 392 |  |
Conoco Phillips Company and certain of its subsidiaries | Top of range |  |  |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |  |  |
Average crude oil price | $ / bbl |  | 52.00 |  |  |

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