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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Amounts Outstanding (Details)
$ in Millions, $ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Aug. 02, 2018
CAD ($)
Jul. 20, 2018
Disclosure of detailed information about borrowings [line items]            
Carrying value   $ 3,212   $ 3,267    
Notional amount   3,104   3,234    
Less: current portion of long-term debt   (494)   (130)    
Less: current portion of finance lease obligations   (19)   (18)    
Total current long-term debt and finance lease obligations   (513)   (148)    
Credit facilities, long-term debt, and finance lease obligations (Note 22)   2,699   3,119    
All Borrowings Except Finance Lease Obligations [Member]            
Disclosure of detailed information about borrowings [line items]            
Carrying value   3,070   3,204    
Credit facilities            
Disclosure of detailed information about borrowings [line items]            
Carrying value   220   339    
Notional amount   220   339    
Debentures            
Disclosure of detailed information about borrowings [line items]            
Carrying value   647   647 $ 400  
Notional amount   651   651    
Interest rate         6.40% 6.40%
Senior notes            
Disclosure of detailed information about borrowings [line items]            
Carrying value   905   943    
Notional amount   914   955    
Senior notes | U.S. Dollars            
Disclosure of detailed information about borrowings [line items]            
Notional amount $ 700   $ 700      
Non-recourse            
Disclosure of detailed information about borrowings [line items]            
Carrying value   1,144   1,236    
Notional amount   1,157   1,250    
Non-recourse | U.S. Dollars            
Disclosure of detailed information about borrowings [line items]            
Notional amount 1   1      
Other            
Disclosure of detailed information about borrowings [line items]            
Carrying value   154   39    
Notional amount   162   39    
Other | U.S. Dollars            
Disclosure of detailed information about borrowings [line items]            
Notional amount $ 117   $ 21      
Finance lease obligation            
Disclosure of detailed information about borrowings [line items]            
Carrying value   $ 142   $ 63    
Weighted average [member] | Credit facilities            
Disclosure of detailed information about borrowings [line items]            
Interest rate 3.50% 3.50% 3.80% 3.80%    
Weighted average [member] | Debentures            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.80% 5.80% 5.80% 5.80%    
Weighted average [member] | Senior notes            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.40% 5.40% 5.40% 5.40%    
Weighted average [member] | Non-recourse            
Disclosure of detailed information about borrowings [line items]            
Interest rate 4.30% 4.30% 4.40% 4.40%    
Weighted average [member] | Other            
Disclosure of detailed information about borrowings [line items]            
Interest rate 7.10% 7.10% 9.20% 9.20%