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Financial Instruments - Financial Instrument Sensitivities (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / bbl $ / MMBTU $ / Mcf | Dec. 31, 2019 CAD ($) $ / bbl $ / MMBTU $ / Mcf | Dec. 31, 2018 CAD ($)
Commodity price risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase NYMEX/AECO US$0.10/MMBtu (USD per MMBtu) | $ / MMBTU | 0.10 | 0.10 |
Decrease NYMEX/AECO US$0.10/MMBtu (USD per MMBtu) | $ / MMBTU | 0.10 | 0.10 |
Increase AECO $0.10/Mcf (CAD per Mcf) | $ / Mcf | 0.10 | 0.10 |
Decrease AECO $0.10/Mcf (CAD per Mcf) | $ / Mcf | 0.10 | 0.10 |
Increase WCS differential US$1.00/bbl (USD per bbl) | $ / bbl | 1.00 | 1.00 |
Decrease WCS differential US$1.00/bbl (USD per bbl) | $ / bbl | 1.00 | 1.00 |
Decrease AECO $0.10/Mcf (USD per Mcf) | $ / Mcf | 0.10 | 0.10 |
Interest rate risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase interest rate 1% | 1.00% | 1.00% |
Decrease interest rate 1% | 1.00% | 1.00% |
Increase (decrease) to net earnings |  | $ (48) | $ (33)
Increase (decrease) to net earnings |  | 48 | 33
(Increase) decrease to other comprehensive loss |  | (21) | (21)
(Increase) decrease to other comprehensive loss |  | 24 | 25
Foreign currency exchange rate risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase exchange rate by US$0.01 | $ 0.01 |  |
Decrease exchange rate by US$0.01 | $ 0.01 |  |
Increase (decrease) to net earnings |  | (103) | (114)
Increase (decrease) to net earnings |  | 100 | 113
(Increase) decrease to other comprehensive loss |  | 0 | 0
(Increase) decrease to other comprehensive loss |  | 0 | 0
AECO basis swap | Commodity price risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase (decrease) to net earnings |  | 1 | 0
Increase (decrease) to net earnings |  | (1) | 0
(Increase) decrease to other comprehensive loss |  | 0 | 0
(Increase) decrease to other comprehensive loss |  | 0 | 0
AECO Swap | Commodity price risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase (decrease) to net earnings |  | (1) | (1)
Increase (decrease) to net earnings |  | 1 | 1
(Increase) decrease to other comprehensive loss |  | 0 | 0
(Increase) decrease to other comprehensive loss |  | 0 | 0
WCS differential swaps | Commodity price risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase (decrease) to net earnings |  | 0 | (5)
Increase (decrease) to net earnings |  | 0 | 5
(Increase) decrease to other comprehensive loss |  | 0 | 0
(Increase) decrease to other comprehensive loss |  | $ 0 | $ 0

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