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Debt - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 04, 2018 CAD ($) | Apr. 16, 2018 CAD ($) | Jun. 30, 2018 CAD ($) | Jun. 30, 2017 CAD ($) | Jun. 30, 2018 CAD ($) | Jun. 30, 2017 CAD ($) | Mar. 29, 2018 CAD ($) | Mar. 29, 2018 USD ($) | Mar. 12, 2018 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Early debt redemption costs |  |  | $ 18,000,000 | $ 4,000,000 | $ 18,000,000 | $ 4,000,000 |  |  |
Series M-28 Medium-Term Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Principal amount redeemed | $ 400,000,000 |  |  |  |  |  |  |  |
Series M-28 Medium-Term Notes | 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 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Principal amount redeemed |  | $ 300,000,000 |  |  |  |  |  |  |
Series M-33 Debentures | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.52% |  |  |  |  |  |  |
Series M-25 Debentures |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |
Series M-25 Debentures | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.35% |  | 3.35% |  |  |  |
Series US-1 Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 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% |
Series M-47 Medium-Term Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 500,000,000
Series M-47 Medium-Term Notes | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.35%

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