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Risk Management Activities - Cash Flow Hedges (Details) - Foreign exchange forward contracts – foreign-denominated receipts/expenditures - Cash flow hedges - Currency risk $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 AUD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
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Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |  |
Notional amount sold |  |  |  | $ 71 |
Derivative, notional amount purchased |  |  |  |  | $ 54
Financial assets, at fair value |  |  |  | $ (2) |
Within one year |  |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |  |
Notional amount sold | $ 10 |  | $ 19 |  |
Financial liabilities, at fair value | $ 0 |  |  |  |
Within one year | Minimum |  |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |  |
Derivative, notional amount purchased |  | $ 8 |  |  |
Within one year | Maximum |  |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |  |
Derivative, notional amount purchased |  | $ 14 |  |  |

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