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Risk Management Activities - Additional Information (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Current non-cash assets pledged as collateral for which transferee has right by contract or custom to sell or repledge collateral | $ 55,000,000 | $ 49,000,000 |  |  |
Financial assets pledged as collateral for liabilities or contingent liabilities | 18,000,000 | 0 |  |  |
Derivative, contingent feature, additional collateral requirement | 120,000,000 | $ 85,000,000 |  |  |
Asset-backed debt instruments held | 515,000,000 |  |  |  |
Debt instruments held | $ 1,000,000,000 |  |  |  |
Borrowings subject to floating interest rates | 3.00% | 7.00% |  | 3.00% | 7.00%
Sensitivity analysis used by management for the foreign exchange differences from functional currency | $ 0.03 | $ 0.03 | $ 0.03 |  |
Borrowings | $ 3,267,000,000 | 3,361,000,000 |  |  |
Target percentage of hedged forecasted foreign operating cash flows over four year period | 60.00% |  |  |  |
Target percentage of hedged forecasted foreign operating cash flows, current period | 90.00% |  |  |  |
Target percentage of hedged forecasted foreign operating cash flows, next year | 70.00% |  |  |  |
Target percentage of hedged forecasted foreign operating cash flows, third year | 50.00% |  |  |  |
Target percentage of hedged forecasted foreign operating cash flows, fourth year | 30.00% |  |  |  |
Maximum exposure to credit risk | $ 37,000,000 | 22,000,000 |  |  |
Other comprehensive income that will be reclassified to profit or loss, net of tax | (222,000,000) | (90,000,000) | (19,000,000) |  |
Gains (losses) on change in fair value of derivatives | 97,000,000 | 43,000,000 | 33,000,000 |  |
Gains on change in fair value of derivatives | 6,000,000 | 11,000,000 | 24,000,000 |  |
Unrealised loss on change in fair value of derivatives |  | 2,000,000 |  |  |
Unrealised gains on change in fair value of derivatives | 4,000,000 |  | 6,000,000 |  |
Net realized gains on change in fair value of derivatives | 2,000,000 | 13,000,000 | 18,000,000 |  |
Unrealized pre-tax gains (losses) | (1,000,000) | 1,000,000 | 1,000,000 |  |
Within one year |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Other comprehensive income that will be reclassified to profit or loss, net of tax | $ 25,000,000 |  |  |  |
Long-term debt | Net investment hedges |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount |  |  |  | $ 370 | $ 370
Forward contract |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount |  | $ 150,000,000 |  | 400 |
Bond, forward yield |  | 1.20% |  |  |
Interest rate swap |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount |  |  |  | 150 |
Bond Lock Agreement [Member] |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount |  | $ 75,000,000 |  | 150 |
Bond, interest rate | 1.375% | 5.75% |  |  |
Commodity Price Risk - Proprietary Trading [Member] |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | $ 2,000,000 | $ 1,000,000 | 1,000,000 |  |
Commodity Price Risk - Generation [Member] |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | 33,000,000 | 12,000,000 | 25,000,000 |  |
Commodity Price Risk - Generation - Mark To Market Value [Member] |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Value at risk | $ 51,000,000 | $ 15,000,000 | $ 8,000,000 |  |
Interest rate risk | Interest rate swap |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Notional amount |  |  |  | 150 | $ 150
Borrowings |  |  |  | $ 400 |
Interest rate risk | Interest rate swap | Fixed interest rate [member] |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Derivate, fixed interest rate | 0.94% | 0.94% |  |  |
Letter of credit |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Collateral posted on derivative liabilities | $ 356,000,000 | $ 163,000,000 |  |  |

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