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Debt - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Loss on debt repurchases | $ 26 |  | $ 216 |
Notes Purchased [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Principal amount of notes repurchased |  | $ 1,000 |  | $ 1,260
Cost of purchases |  | 1,010 |  | 1,360
Loss on debt repurchases | $ 26 |  | $ 216 |
3.0% notes due March 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Principal amount of notes repurchased |  |  |  | $ 278
Borrowings, interest rate |  |  | 3.00% | 3.00%
4.5% notes due January 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Principal amount of notes repurchased |  | $ 103 |  | $ 280
Borrowings, interest rate | 4.50% | 4.50% | 4.50% | 4.50%
8.0% notes due June 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Principal amount of notes repurchased |  |  |  | $ 650
Borrowings, interest rate |  |  | 8.00% | 8.00%
Loss on write-off of prepayment Option |  |  | $ 75 |
4.75% notes due January 2022 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Principal amount of notes repurchased |  | $ 471 |  | $ 28
Borrowings, interest rate | 4.75% | 4.75% | 4.75% | 4.75%
3.75% notes due February 2023 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Principal amount of notes repurchased |  | $ 426 |  | $ 24
Borrowings, interest rate | 3.75% | 3.75% | 3.75% | 3.75%

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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