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Debt - Scheduled Principal Payments (Detail) - Dec. 31, 2018 $ in Millions, $ in Millions | CAD ($) | USD ($)
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Principal payments | $ 5,227 | $ 3,832
2020 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal payments | 31 | 23
2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal payments | 159 | 117
2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal payments | 275 | 202
2023 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal payments | 300 | 220
More Than 5 Years [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal payments | $ 4,462 | $ 3,270

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