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Financial assets and liabilities - Market risk (Details) $ in Millions, $ in Millions | Jun. 30, 2018 CAD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Currency risk |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Percentage of possible change in risk variable | 10.00% | 10.00% |  |
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 |  |  |
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 |  |  | $ 967 | $ 750
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 |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income | 139 |  |  |
Bottom of range | Currency risk |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Reasonably possible change in risk variable impact on net earnings | (3) |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income | (134) |  |  |
2018 | Currency risk | 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 |  | $ 2,499 |  |
2018 | Currency risk | 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 | 3,244 |  |  |
2018 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to receive |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 450 |  |
2018 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to pay |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 584 |  |  |
2018 | Currency risk | Economic | Anticipated Transactions [Member] | Amount to receive |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 19 |  |
2018 | Currency risk | Economic | Anticipated Transactions [Member] | Amount to pay |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 24 |  |  |
2018 | Purchased call options | Currency risk | Economic | Anticipated Transactions [Member] | Amount to receive |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 33 |  |
2018 | Purchased call options | Currency risk | Economic | Anticipated Transactions [Member] | Amount to pay |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 41 |  |  |
2018 | Written put options | Currency risk | Economic | Anticipated Transactions [Member] | Amount to receive |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 99 |  |
2018 | Written put options | Currency risk | Economic | Anticipated Transactions [Member] | Amount to pay |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 119 |  |  |
2018 - 2019 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to receive |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 46 |  |  |
2018 - 2019 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to pay |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 36 |  |
2019 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to receive |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | 775 |  |
2019 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to pay |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 968 |  |  |
2020 - 2021 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to receive |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value |  | $ 76 |  |
2020 - 2021 | Currency risk | Cash flow | Anticipated Transactions [Member] | Amount to pay |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 96 |  |  |

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