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Other Liabilities - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended 122 Months Ended
Nov. 08, 2007
USD ($)
Sep. 30, 2020
CAD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of information about consolidated structured entities [line items]            
Net gains (losses) on available-for-sale assets       $ 451,000,000 $ 167,000,000  
Interest and investment income (loss)       5,407,000,000 5,855,000,000  
Maximum borrowing capacity       846,000,000 859,000,000  
Interest expense       355,000,000 333,000,000  
Borrowed Funds            
Disclosure of information about consolidated structured entities [line items]            
Interest expense on borrowings       22,000,000 13,000,000  
Variable Principal Floating Rate Certificate            
Disclosure of information about consolidated structured entities [line items]            
Interest expense       28,000,000 64,000,000  
Financial liabilities, at fair value       $ 0 $ 1,874,000,000  
Variable Principal Floating Rate Certificate | Consolidated structured entities            
Disclosure of information about consolidated structured entities [line items]            
Proceeds from borrowings $ 1,000         $ 515
Repayments of borrowings, classified as financing activities   $ 2,020,000,000 $ 1,515      
Net gains (losses) on available-for-sale assets   282,000,000        
Interest and investment income (loss)   $ (342,000,000)