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Debt - Revolving Facilities - Additional Information (Detail) CAD in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | CAD 6,369 |  | CAD 8,343
Debt-to-capitalization ratio | 0.25% | 0.25% |
Outstanding letters of credit | $ |  | $ 839 |
Surety bonds outstanding | CAD 350 |  |
Top of range [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt-to-capitalization ratio | 0.50% | 0.50% |
Facility type one [member] | Revolving credit facilities [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ |  | $ 3,000 |
Maturity date | October 2022 |  |
Facility type two [member] | Revolving credit facilities [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ |  | 1,200 |
Maturity date | October 2020 |  |
Outstanding letters of credit | $ |  | $ 809 |
Uncommitted credit facilities [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | CAD 1,460 |  |
Outstanding letters of credit | 1,270 |  |
Stand alone credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Outstanding letters of credit | CAD 336 |  |

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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Debt to capitalization conversion ratio + References No definition available. + Details
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- Definition Letters of credit outstanding amount 1. + References No definition available. + Details
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- Definition Letters of credit outstanding for security. + References No definition available. + Details
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- Definition Surety bonds outstanding. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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