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Financial and capital management - Interest rate exposures (Details) - Interest rate risk - CAD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items] |  |
Percentage of possible change in risk variable | 1.00% |
Interest rate exposure, interest rate percent decrease | 1.00% |
Reasonably possible change in risk variable impact on net earnings | $ 29,000,000 |
Fair value hedges | Interest rate swap contract |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument settled |  | $ 700,000,000
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness |  | 15,000,000
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness |  | 16,000,000
Non-current borrowings | Fair value hedges | Interest rate lock |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument settled |  | 500,000,000
Dividend rate resets on preferred shares | Fair value hedges | Interest rate lock |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument settled |  | $ 350,000,000

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