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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Amounts Outstanding (Details)
$ in Millions, $ in Millions
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Aug. 02, 2018
CAD ($)
Jul. 20, 2018
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]            
Carrying value $ 3,267       $ 3,707  
Notional amount 3,234       3,664  
Less: current portion of long-term debt (130)       (729)  
Less: current portion of finance lease obligations (18)       (18)  
Total current long-term debt and finance lease obligations (148)       (747)  
Credit facilities, long-term debt, and finance lease obligations (Note 22) 3,119       2,960  
All Borrowings Except Finance Lease Obligations [Member]            
Disclosure of detailed information about borrowings [line items]            
Carrying value 3,204       3,638  
Credit facilities            
Disclosure of detailed information about borrowings [line items]            
Carrying value 339       27  
Notional amount 339       27  
Debentures            
Disclosure of detailed information about borrowings [line items]            
Carrying value 647   $ 400   1,046  
Notional amount 651       1,051  
Interest rate     6.40% 6.40%    
Senior notes            
Disclosure of detailed information about borrowings [line items]            
Carrying value 943       1,499  
Notional amount 955       1,510  
Senior notes | U.S. Dollars            
Disclosure of detailed information about borrowings [line items]            
Notional amount   $ 700       $ 1,200
Non-recourse            
Disclosure of detailed information about borrowings [line items]            
Carrying value 1,236       1,022  
Notional amount 1,250       1,032  
Non-recourse | U.S. Dollars            
Disclosure of detailed information about borrowings [line items]            
Notional amount   1       27
Other            
Disclosure of detailed information about borrowings [line items]            
Carrying value 39       44  
Notional amount 39       44  
Other | U.S. Dollars            
Disclosure of detailed information about borrowings [line items]            
Notional amount   $ 21       $ 24
Finance lease obligation            
Disclosure of detailed information about borrowings [line items]            
Carrying value $ 63       $ 69  
Weighted average [member] | Credit facilities            
Disclosure of detailed information about borrowings [line items]            
Interest rate 3.80% 3.80%     2.80% 2.80%
Weighted average [member] | Debentures            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.80% 5.80%     6.00% 6.00%
Weighted average [member] | Senior notes            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.40% 5.40%     6.00% 6.00%
Weighted average [member] | Non-recourse            
Disclosure of detailed information about borrowings [line items]            
Interest rate 4.40% 4.40%     4.30% 4.30%
Weighted average [member] | Other            
Disclosure of detailed information about borrowings [line items]            
Interest rate 9.20% 9.20%     9.20% 9.20%