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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Assets | $ 57,100 | $ 55,802 | $ 51,547
Liabilities | $ (36,411) | (35,177) | (32,631)
Repurchase obligation of trust ownership percentage | 9.00% |  |
MLSE financial liability |  |  |
Disclosure of financial assets [line items] |  |  |
Liabilities | $ (135) | (135) | (135)
MLSE financial liability | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |  |
Disclosure of financial assets [line items] |  |  |
Liabilities | 0 | 0 | 0
MLSE financial liability | OBSERVABLE MARKET DATA (LEVEL 2) |  |  |
Disclosure of financial assets [line items] |  |  |
Liabilities | 0 | 0 | 0
MLSE financial liability | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |  |
Disclosure of financial assets [line items] |  |  |
Liabilities | (135) | (135) | (135)
Publicly-traded and privately-held investments |  |  |
Disclosure of financial assets [line items] |  |  |
Assets | 110 | 103 | 103
Publicly-traded and privately-held investments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets | 1 | 1 | 1
Publicly-traded and privately-held investments | OBSERVABLE MARKET DATA (LEVEL 2) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets | 0 | 0 | 0
Publicly-traded and privately-held investments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets | 109 | 102 | 102
Derivative financial instruments | Derivative financial instruments |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | 181 | (48) | 166
Derivative financial instruments | Derivative financial instruments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | 0 | 0 | 0
Derivative financial instruments | Derivative financial instruments | OBSERVABLE MARKET DATA (LEVEL 2) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | 181 | (48) | 166
Derivative financial instruments | Derivative financial instruments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | 0 | 0 | 0
Other | Other |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | 43 | 60 | 35
Other | Other | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | 0 | 0 | 0
Other | Other | OBSERVABLE MARKET DATA (LEVEL 2) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | 114 | 106 | 88
Other | Other | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |  |
Disclosure of financial assets [line items] |  |  |
Assets (liabilities) | $ (71) | $ (46) | $ (53)

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