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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