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Financial Instruments - Financial Instrument Sensitivities (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 $ / MMBTU | Dec. 31, 2021 $ / Mcf | Dec. 31, 2021 $ / bbl | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 $ / MMBTU | Dec. 31, 2020 $ / Mcf | Dec. 31, 2020 $ / bbl
Interest rate risk |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) to net earnings |  | $ (13) |  |  |  |  | $ (53) |  |  |
Increase (decrease) to net earnings |  | 13 |  |  |  |  | 53 |  |  |
Increase (decrease) to other comprehensive income |  | (29) |  |  |  |  | (17) |  |  |
Increase (decrease) to other comprehensive income |  | 39 |  |  |  |  | 20 |  |  |
Increase interest rate 1% | 1.00% |  |  |  |  |  |  |  |  |
Decrease interest rate 1% | 1.00% |  |  |  |  |  |  |  |  |
Currency risk |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) to net earnings |  | (116) |  |  |  |  | (126) |  |  |
Increase (decrease) to net earnings |  | 114 |  |  |  |  | 123 |  |  |
Increase (decrease) to other comprehensive income |  | 0 |  |  |  |  | 0 |  |  |
Increase (decrease) to other comprehensive income |  | $ 0 |  |  |  |  | $ 0 |  |  |
Weakening of the Canadian dollar by US$0.01 |  |  | $ 0.01 |  |  |  |  |  |  |
Strengthening of the Canadian dollar by US$0.01 |  |  | $ 0.01 |  |  |  |  |  |  |
Commodity price risk |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Movement of natural gas and crude oil basis swap |  |  |  | 0.10 | 0.10 | 1.00 |  | 0.10 | 0.10 | 1.00

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