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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details)
$ in Millions, $ in Millions, $ in Millions
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Oct. 22, 2020
AUD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Aug. 02, 2018
CAD ($)
Jul. 20, 2018
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 3,361     $ 3,212      
Interest rate     4.07%       4.509%
Less: current portion of long-term debt (97)     (494)      
Less: current portion of lease liabilities (8)     (19)      
Total current long-term debt and lease liabilities (105)     (513)      
Credit facilities, long-term debt, and finance lease obligations 3,256     2,699      
All Borrowings Except Finance Lease Obligations              
Disclosure of detailed information about borrowings [line items]              
Carrying value 3,227     3,070      
Notional amount 3,264     3,104      
Credit facilities              
Disclosure of detailed information about borrowings [line items]              
Carrying value 114     220      
Notional amount 114     220      
Debentures              
Disclosure of detailed information about borrowings [line items]              
Carrying value 249     647   $ 400  
Notional amount 251     651      
Interest rate           6.40% 6.40%
Senior notes              
Disclosure of detailed information about borrowings [line items]              
Carrying value 886     905      
Notional amount 894     914      
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 1,837     1,144      
Notional amount 1,858     1,157      
Other              
Disclosure of detailed information about borrowings [line items]              
Carrying value 141     154      
Notional amount 147     162      
Other | U.S. Dollars              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 110     $ 117    
Finance lease obligation              
Disclosure of detailed information about borrowings [line items]              
Carrying value $ 134     $ 142      
Senior Secured Note Maturing June 2042              
Disclosure of detailed information about borrowings [line items]              
Carrying value     $ 800        
Interest rate     4.07%        
Weighted average | Credit facilities              
Disclosure of detailed information about borrowings [line items]              
Interest rate 2.70% 2.70%   3.50% 3.50%    
Weighted average | Debentures              
Disclosure of detailed information about borrowings [line items]              
Interest rate 7.10% 7.10%   5.80% 5.80%    
Weighted average | Senior notes              
Disclosure of detailed information about borrowings [line items]              
Interest rate 5.40% 5.40%   5.40% 5.40%    
Weighted average | Non-recourse              
Disclosure of detailed information about borrowings [line items]              
Interest rate 4.10% 4.10%   4.30% 4.30%    
Weighted average | Other              
Disclosure of detailed information about borrowings [line items]              
Interest rate 7.10% 7.10%   7.10% 7.10%