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v3.19.1

Long-term debt - Narrative (Details) |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
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Oct. 15, 2018 CAD ($) | Sep. 21, 2018 CAD ($) | May 04, 2018 CAD ($) | Apr. 16, 2018 CAD ($) | Oct. 30, 2017 CAD ($) | Oct. 09, 2017 CAD ($) | May 12, 2017 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Sep. 14, 2018 CAD ($) | Sep. 14, 2018 USD ($) | Aug. 21, 2018 CAD ($) | Mar. 29, 2018 CAD ($) | Mar. 29, 2018 USD ($) | Mar. 12, 2018 CAD ($) | Sep. 29, 2017 CAD ($) | Feb. 27, 2017 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early debt redemption costs |  |  |  |  |  |  |  | $ 20,000,000 | $ 20,000,000 |  |  |  |  |  |  |  |
Series 8 notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series 8 notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-25 medium term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-25 medium term notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series US-1 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 526,000,000 | $ 400,000,000 |  | $ 967,000,000 | $ 750,000,000 |  |  |
Series US-1 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.464% | 4.464% |  | 4.464% | 4.464% |  |  |
Series M-48 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
Series M-48 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 3.80% |  |  |  |  |
Series M-28 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-28 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series 9 notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series 9 notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.59% |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-33 debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.52% |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-47 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
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-22 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Series M-22 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.40% |  |  |  |  |  |  |  |  |  |  |  |
Series M-36 debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Series M-36 debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 4.88% |  |  |  |  |  |  |  |  |  |  |
Series M-40 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |
Series M-40 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |
Series M-46 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |
Series M-46 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.60% |
Series M-35 debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |
Series M-35 debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.37% |  |  |  |  |  |  |  |  |  |
Series M-44 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Series M-44 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70%
Series M-45 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Series M-45 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.45%

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