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Financial and capital management - Details on Outstanding Foreign Currency Forward Contracts and Cross Currency Basis Swaps (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2017 CAD ($)
Interest rate risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Percentage of possible change in risk variable |  |  | 1.00% | 1.00% |
Reasonably possible change in risk variable impact on net earnings |  |  | $ 31,000,000 |  |
Equity price risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Percentage of possible change in risk variable |  |  | 5.00% | 5.00% |
Reasonably possible change in risk variable impact on net earnings |  |  | $ 34,000,000 |  |
Currency risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Nominal amount of hedging instrument settled | $ 480,000,000 | $ 357 |  |  |
Percentage of possible change in risk variable |  |  | 10.00% | 10.00% |
Currency risk | Maturing in 2019 | Cash flow | Commercial paper | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  |  | $ 2,329 |
Currency risk | Maturing in 2019 | Cash flow | Commercial paper | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | $ 3,077,000,000 |  |
Currency risk | Maturing in 2019 | Cash flow | Anticipated transactions | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 15,000,000 | 779 |
Currency risk | Maturing in 2019 | Cash flow | Anticipated transactions | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 973,000,000 | 12 |
Currency risk | Maturing in 2019 | Economic | Anticipated transactions | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  |  | 120 |
Currency risk | Maturing in 2019 | Economic | Anticipated transactions | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 153,000,000 |  |
Currency risk | Maturing in 2020 - 2021 | Cash flow | Anticipated transactions | Amount to receive |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  |  | 256 |
Currency risk | Maturing in 2020 - 2021 | Cash flow | Anticipated transactions | Amount to pay |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 324,000,000 |  |
Currency risk | Maturing in 2020 | Fair value hedges | Anticipated transactions | Amount to receive | Economic - call options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  |  | 48 |
Currency risk | Maturing in 2020 | Fair value hedges | Anticipated transactions | Amount to pay | Economic - call options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 60,000,000 |  |
Currency risk | Maturing in 2019 - 2020 | Fair value hedges | Anticipated transactions | Amount to receive | Economic - put options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  |  | 60 |
Currency risk | Maturing in 2019 - 2020 | Fair value hedges | Anticipated transactions | Amount to pay | Economic - put options |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 74,000,000 |  |
Top of range | Currency risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  |  | 2,000,000 |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income |  |  | 140,000,000 |  |
Bottom of range | Currency risk |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  |  | 0 |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income |  |  | (132,000,000) |  |
Interest rate swap contract | Interest rate risk | Fair value hedges |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 1,493,000,000 | $ 1,150 |
Forward contract | Equity price risk | Settlement of share-based compensation plans |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 45,000,000 |  | $ 73,000,000 |  | $ 111,000,000

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