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Financial and capital management - Market risk (Details) - 12 months ended Dec. 31, 2017 - Currency risk | CAD ($) | USD ($) | USD ($)
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Disclosure of detailed information about hedged items [line items] |  |  |
Nominal amount of hedging instrument settled | $ 480,000,000 | $ 357,000,000 |
Percentage of possible change in risk variable | 10.00% |  | 10.00%
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 | 133,000,000 |  |
Maturing in 2018 | 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 |  |  | $ 2,492,000,000
Maturing in 2018 | 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 | 3,180,000,000 |  |
Maturing in 2018 | 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 |  |  | 872,000,000
Maturing in 2018 | 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 | 1,134,000,000 |  |
Maturing in 2018 | Fair value hedges | Anticipated transactions | Amount to receive |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value |  |  | 36,000,000
Maturing in 2018 | Fair value hedges | Anticipated transactions | Amount to pay |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Financial instruments designated as hedging instruments, at fair value | 46,000,000 |  |
Maturing in 2018 - 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 | 97,000,000 |  |
Maturing in 2018 - 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 |  |  | 75,000,000
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 |  |  | 576,000,000
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 | 721,000,000 |  |
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 |  |  | $ 76,000,000
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 | $ 96,000,000 |  |

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