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Risk Management - Additional Information (Detail) $ in Millions | Jun. 30, 2022 CAD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Jun. 30, 2021 CAD ($) | Mar. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
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Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Fair value of derivative financial instruments net | $ 1,000,000 |  |  | $ (68,000,000) |  |  |
Cash and cash equivalents | 3,693,000,000 |  | $ 3,399,000,000 | 2,873,000,000 | $ 1,055,000,000 | $ 873,000,000 | $ 378,000,000
Uncommitted demand facilities | 0 |  |  | $ 0 |  |  |
Interest Rate, Foreign Exchange or Cross Currency Interest Rate Swap |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Notional value | $ 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% |  | 0.10% |  |  |
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 | Minimum |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Percent of accounts receivable held with investment grade counterparties | 96.00% | 96.00% |  |  |  |  |
Foreign Exchange Contracts |  |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |  |
Fair value of derivative financial instruments net | $ 1,000,000 |  |  |  |  |  |
Notional value |  | $ 422 |  |  |  |  |

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