XML 132 R98.htm IDEA: XBRL DOCUMENT
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Debt - Revolving Facilities - Additional Information (Detail) $ in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 23, 2018 CreditFacility | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Number of committed revolving credit facilities | CreditFacility | 2 |  |  |
Debt-to-capitalization ratio |  | 0.13 | 0.13 | 0.21
Outstanding letters of credit for financial security requirements under power purchase agreements |  |  | $ 822 |
Surety bonds outstanding |  | $ 350 |  |
Top of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debt-to-capitalization ratio |  | 0.55 | 0.55 |
US$ 4.0 Billion Revolving Credit Facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowings |  |  | $ 4,000 | $ 3,000
Maturity date |  | November 2023 |  |
US $ 600 Million Revolving Credit Facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowings |  |  | 600 | $ 1,200
Maturity date |  | November 2021 |  |
Outstanding letters of credit |  |  | $ 573 |
Uncommitted credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowings |  | $ 2,150 |  |
Outstanding letters of credit |  | 1,820 |  |
Stand alone credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit |  | $ 369 |  |

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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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