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Commitments and Contingencies - Future Payments for Commitments (Details) - CAD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | $ 29,386 |  |
Real Estate | 928 |  |
Obligation to Fund Equity-Accounted Affiliate | 650 |  |
Other Long-Term Commitments | 2,379 |  |
Total Payments | $ 33,343 |  |
Arrangement |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage |  | $ 7,400 |
Total Payments |  | 17,600 |
WRB, Sunrise and Toledo |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Ownership interest | 50.00% |  |
Commitments approved and not yet in service |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | $ 8,100 |  | $ 14,000
Commitments approved and not yet in service | Arrangement |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage |  | $ 1,700 |
Bottom of range |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Lease terms | 20 years |  |
Remainder of Year |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | $ 911 |  |
Real Estate | 11 |  |
Obligation to Fund Equity-Accounted Affiliate | 13 |  |
Other Long-Term Commitments | 335 |  |
Total Payments | 1,270 |  |
2 Years |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | 2,815 |  |
Real Estate | 46 |  |
Obligation to Fund Equity-Accounted Affiliate | 68 |  |
Other Long-Term Commitments | 219 |  |
Total Payments | 3,148 |  |
3 Years |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | 3,077 |  |
Real Estate | 45 |  |
Obligation to Fund Equity-Accounted Affiliate | 86 |  |
Other Long-Term Commitments | 191 |  |
Total Payments | 3,399 |  |
4 Years |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | 2,892 |  |
Real Estate | 54 |  |
Obligation to Fund Equity-Accounted Affiliate | 91 |  |
Other Long-Term Commitments | 144 |  |
Total Payments | 3,181 |  |
5 Years |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | 2,085 |  |
Real Estate | 57 |  |
Obligation to Fund Equity-Accounted Affiliate | 91 |  |
Other Long-Term Commitments | 151 |  |
Total Payments | 2,384 |  |
Thereafter |  |  |
Disclosure Of Commitments And Contingent Liabilities [Line Items] |  |  |
Transportation and Storage | 17,606 |  |
Real Estate | 715 |  |
Obligation to Fund Equity-Accounted Affiliate | 301 |  |
Other Long-Term Commitments | 1,339 |  |
Total Payments | $ 19,961 |  |

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