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Other Liabilities - Narrative (Details)
 12 Months Ended 122 Months Ended
Nov. 08, 2007
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of information about consolidated structured entities [line items]            
Maximum borrowing capacity   $ 891,000,000 $ 835,000,000      
Interest expense   305,000,000 303,000,000      
Borrowed Funds            
Disclosure of information about consolidated structured entities [line items]            
Interest expense on borrowings   10,000,000 13,000,000      
Variable Principal Floating Rate Certificate            
Disclosure of information about consolidated structured entities [line items]            
Interest expense   57,000,000 36,000,000      
Financial liabilities, at fair value   $ 1,879,000,000 $ 1,776,000,000      
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 $ 0