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Risk Management - Additional Information (Detail) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 CAD ($) | Jan. 10, 2022 | Dec. 31, 2021 USD ($) | Oct. 31, 2021 | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value |  |  | $ 7,400 |  |  | $ 5,900 |  |
Fair Value Asset (Liability) | $ (68,000,000) |  |  |  | $ (53,000,000) |  | $ 3,000,000 |
Interest rate sensitivity floating rate debt | 1,000,000 |  |  |  | 1,000,000 |  |  |
Cash and cash equivalents | 2,873,000,000 |  |  |  | 378,000,000 |  | $ 186,000,000 | $ 781,000,000
Long-Term Debt |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value | 12,113,000,000 |  | 7,385 |  | 7,510,000,000 | 5,898 |  |
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value | 9,363,000,000 |  | 7,385 |  | 7,510,000,000 | 5,898 |  |
U.S. Dollar Denominated Unsecured Notes | 3.80% due September 15, 2023 | Long-Term Debt |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value | $ 146,000,000 |  | $ 115 |  | 573,000,000 | 450 |  |
Long-term debt, interest rate | 3.80% | 3.80% | 3.80% |  |  |  |  |
U.S. Dollar Denominated Unsecured Notes | 4.00% due April 15, 2024 | Long-Term Debt |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value | $ 341,000,000 |  | $ 269 |  | 0 | $ 0 |  |
Long-term debt, interest rate | 4.00% | 4.00% | 4.00% | 4.00% |  |  |  |
WRB Refining LP |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Uncommitted demand facilities |  |  | $ 88 |  |  |  |  |
Sunrise |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Uncommitted demand facilities | $ 5,000,000 |  |  |  |  |  |  |
Uncommitted Demand Facility |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Uncommitted demand facilities | 1,900,000,000 |  |  |  |  |  |  |
Top of range | Uncommitted Demand Facility |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Amount of undrawn facilities for general purposes | 1,400,000,000 |  |  |  |  |  |  |
Liquidity risk | Committed Credit Facility |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Uncommitted demand facilities | $ 6,000,000,000 |  |  |  |  |  |  |
Liquidity risk | Top of range | Base Shelf Prospectus |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Uncommitted demand facilities |  |  | 4,700 |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Changes in interest rate percentage | 100.00% |  |  |  |  |  |  |
Foreign exchange contracts |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value |  |  | $ 144 |  |  |  |  |
Fair Value Asset (Liability) | $ 2,000,000 |  |  |  |  |  |  |
Interest rate swap contract |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value | $ 0 |  |  |  | $ 0 |  |  |
Trade Receivables | Credit risk |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Average expected credit loss rate | 0.10% |  | 0.10% |  | 0.50% | 0.50% |  |
Trade Receivables | Credit risk | Investment grade counterparties |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Number of days outstanding for accruals, joint operations, trade receivables and net investment in finance leases | 60 days |  | 60 days |  |  |  |  |
Trade Receivables | Credit risk | Investment grade counterparties | Bottom of range |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Percent of accounts receivable held with investment grade counterparties | 97.00% |  | 97.00% |  |  |  |  |
Cross Currency Interest Rate Swap |  |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Notional value | $ 0 |  |  |  | $ 0 |  |  |

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