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Risk Management - Additional Information (Detail) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Total Debt Principal |  |  | $ 5,898 | $ 4,998 |  |
Fair Value of Risk Management Assets and Liabilities | $ 53,000,000 |  |  |  |  |
1% increase/decrease in interest rate on floating rate debt | 1,000,000 | $ 3,000,000 |  |  |  |
Cash and cash equivalents | 378,000,000 | 186,000,000 |  |  | $ 781,000,000 | $ 610,000,000
Available borrowing capacity | 1,100,000,000 |  |  |  |  |
Uncommitted demand facilities | 1,100,000,000 |  |  |  |  |
WRB [Member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Available borrowing capacity |  |  | 55 |  |  |
Uncommitted demand facilities |  |  | 55 |  |  |
Committed Credit Facility [Member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 378,000,000 |  |  |  |  |
Top of Range [Member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Target debt to adjusted EBITDA ratio | 2.0 |  |  |  |  |
Available borrowing capacity | $ 1,600,000,000 |  |  |  |  |
Uncommitted demand facilities | 1,600,000,000 |  |  |  |  |
Amount of undrawn facilities for general purposes | $ 600,000,000 |  |  |  |  |
Interest rate risk [member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Changes in interest rate percentage | 1.00% |  |  |  |  |
Liquidity risk [member] | Committed Credit Facility [Member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Available borrowing capacity | $ 4,500,000,000 |  |  |  |  |
Uncommitted demand facilities | 4,500,000,000 |  |  |  |  |
Liquidity risk [member] | Top of Range [Member] | Base Shelf Prospectus [Member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Available borrowing capacity |  |  | 3,700 |  |  |
Uncommitted demand facilities |  |  | $ 3,700 |  |  |
Interest Rate, Foreign Exchange or Cross Currency Interest Rate Swap [Member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Total Debt Principal | 0 |  |  |  |  |
Notional Amount of Interest Rate Swaps [member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Total Debt Principal |  | $ 0 |  |  |  |
Cross Currency Interest Rate Swap |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Total Debt Principal | $ 0 |  |  |  |  |
Trade receivables [member] | Credit risk [member] | Investment grade counterparties [member] |  |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |  |
Percent of accounts receivable held with investment grade counterparties | 98.00% | 97.00% | 98.00% | 97.00% |  |
Number of days outstanding for accruals, joint operations, trade receivables and net investment in finance leases | 60 days | 60 days |  |  |  |
Number of counterparties whose net settlement position individually accounts for more than 10 percent of the fair value of accruals, joint operations, trade receivables and net investment in finance lease | 1 | 1 | 1 | 1 |  |
Average expected credit loss rate | 0.50% | 0.30% | 0.50% | 0.30% |  |
Percentage of counterparties greater than 10 percent of accruals, joint operations, trade receivables and net investment in finance leases | 10.00% |  |  |  |  |

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