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Other Liabilities - Narrative (Details) |  | 12 Months Ended | 122 Months Ended |
--- | --- | --- | --- | ---
Nov. 08, 2007 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Maximum borrowing capacity |  | $ 859,000,000 | $ 891,000,000 |  |
Interest expense |  | 333,000,000 | 305,000,000 |  |
Borrowed Funds |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Interest expense on borrowings |  | 13,000,000 | 10,000,000 |  |
Variable Principal Floating Rate Certificate |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Interest expense |  | 64,000,000 | 57,000,000 |  |
Financial liabilities, at fair value |  | $ 1,874,000,000 | $ 1,879,000,000 |  |
Variable Principal Floating Rate Certificate | Consolidated structured entities |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Proceeds from borrowings | $ 1,000,000,000 |  |  | $ 515,000,000 |
Maximum borrowing capacity |  |  |  |  | $ 2,500,000,000
Borrowings term |  | 1 year |  |  |
Collateral posted per financing agreement |  |  |  |  | $ 0

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