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Long-term debt - Narrative (Details) $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2017 CAD ($) | Oct. 09, 2017 CAD ($) | May 12, 2017 CAD ($) | Sep. 16, 2016 CAD ($) | Mar. 31, 2016 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Mar. 07, 2018 CAD ($) | Sep. 29, 2017 CAD ($) | Feb. 27, 2017 CAD ($) | Aug. 12, 2016 CAD ($) | Feb. 29, 2016 CAD ($) | Jan. 11, 2016 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 2,653,000,000 |  | $ 2,516,000,000 |  |  |  |  |  |
Early debt redemption costs |  |  |  |  |  | (20,000,000) |  | $ (11,000,000) |  |  |  |  |  |
Series M-35 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowing costs recognised as expense |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Series M-44 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Series M-45 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.45% |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
Series M-22 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing costs recognised as expense | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-40 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |
Series M-46 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |  |
Series M-36 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowing costs recognised as expense |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Hedge on M-18 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |
Series M-42 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 850,000,000 |  |
Series M-43 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.90% |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 650,000,000 |  |
Series M-32 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Early debt redemption costs |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |
Series M-41 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |
Series M-19 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000
Series M-23 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Fixed interest rate | Series M-35 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.37% |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | Series M-44 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.70% |  |  |
Fixed interest rate | Series M-22 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.40% |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | Series M-40 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Fixed interest rate | Series M-46 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.60% |  |  |  |
Fixed interest rate | Series M-36 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.88% |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | Hedge on M-18 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Fixed interest rate | Series M-42 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Fixed interest rate | Series M-32 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 5.41% |  |  |  |  |  |  |  |  |
Fixed interest rate | Series M-41 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.55% |
Fixed interest rate | Series M-19 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.64%
Fixed interest rate | Series M-23 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.65%
Gross carrying amount | Unsecured committed term credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 480,000,000 | $ 357 |  |  |  |  |  |  |
Entering into significant commitments or contingent liabilities | Series M-47 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Entering into significant commitments or contingent liabilities | Series M-33 Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |
Entering into significant commitments or contingent liabilities | Fixed interest rate | Series M-47 Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.35% |  |  |  |  |
Entering into significant commitments or contingent liabilities | Fixed interest rate | Series M-33 Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.52% |  |  |  |  |

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