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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial assets [line items] |  |
Assets | $ 60,665 | $ 60,146
Liabilities | $ (39,336) | (38,738)
Repurchase obligation of trust ownership percentage | 9.00% |
MLSE financial liability |  |
Disclosure of financial assets [line items] |  |
Liabilities | $ (149) | (135)
MLSE financial liability | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |
Disclosure of financial assets [line items] |  |
Liabilities | 0 | 0
MLSE financial liability | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Liabilities | 0 | 0
MLSE financial liability | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Liabilities | (149) | (135)
Publicly-traded and privately-held investments |  |
Disclosure of financial assets [line items] |  |
Assets | 126 | 129
Publicly-traded and privately-held investments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |
Disclosure of financial assets [line items] |  |
Assets | 3 | 2
Publicly-traded and privately-held investments | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Assets | 0 | 0
Publicly-traded and privately-held investments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Assets | 123 | 127
Derivative financial instruments | Derivative financial instruments |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | (51) | 165
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
Derivative financial instruments | Derivative financial instruments | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | (51) | 165
Derivative financial instruments | Derivative financial instruments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 0 | 0
Other | Other |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 109 | 71
Other | Other | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 0 | 1
Other | Other | OBSERVABLE MARKET DATA (LEVEL 2) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | 167 | 128
Other | Other | NON-OBSERVABLE MARKET INPUTS (LEVEL 3) |  |
Disclosure of financial assets [line items] |  |
Assets (liabilities) | $ (58) | $ (58)

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