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Long-term debt - Narrative (Details) $ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |
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Nov. 06, 2020 CAD ($) | Sep. 14, 2020 CAD ($) | Mar. 16, 2020 CAD ($) | Jun. 13, 2019 CAD ($) | May 24, 2019 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Aug. 14, 2020 CAD ($) | Jun. 30, 2020 CAD ($) | Jun. 30, 2020 USD ($) | May 14, 2020 CAD ($) | Mar. 25, 2020 CAD ($) | Feb. 13, 2020 CAD ($) | Sep. 10, 2019 CAD ($) | May 13, 2019 CAD ($) | May 13, 2019 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early debt redemption costs |  |  |  |  |  | $ 50 | $ 18 |  |  |  |  |  |  |  |  |
Series M-42 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed | $ 850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-42 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-30 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-30 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-53 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 750 |  |  |  |  |  |  |  |
Series M-53 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 1.65% |  |  |  |  |  |  |  |
Series M-52 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Series M-52 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Series M-51 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500 |  | $ 750 |  |  |
Series M-51 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.50% |  | 3.50% |  |  |
Series M-47 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Series M-47 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 3.35% |  |  |  |
Series M-24 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-24 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.95% |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 2,035 | $ 1,450 |  |  |  |  |  |
Series M-50 medium term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550 |  |
Series M-50 medium term notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.90% |  |
Series M-27 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Series M-27 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Series M-37 debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
Series M-37 debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.54% |  |  |  |  |  |  |  |  |  |  |
Series M-49 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |
Series M-49 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% | 2.75%
Series US-2 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 808 | $ 600
Series US-2 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.30% | 4.30%

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