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Risk Management Activities - Additional Information (Details)
$ in Millions
 12 Months Ended
Oct. 26, 2022
USD ($)
Oct. 25, 2022
USD ($)
Dec. 31, 2022
CAD ($)
agency
agreement
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2022
USD ($)
agency
Dec. 31, 2021
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Floating interest rates     15.00% 3.00%   15.00% 3.00%
Outstanding credit facilities     $ 449,000,000 $ (114,000,000) $ (106,000,000)    
Target percentage, four year period     60.00%        
Target percentage, current period     90.00%        
Target percentage, next year     70.00%        
Target percentage, third year     50.00%        
Target percentage, fourth year     30.00%        
Sensitivity analysis average     $ 0.03 0.03 0.03    
Maximum credit exposure     $ 64,000,000 37,000,000      
Number of credit rating agency | agency     1     1  
Debt maturing     $ 839,000,000        
After-tax gain reclassified from AOCI to net earnings     (460,000,000) (222,000,000) (90,000,000)    
Net unrealized gain     384,000,000 97,000,000 43,000,000    
Gains on foreign exchange and other derivatives     20,000,000 6,000,000 11,000,000    
Unrealised Gains On Change In Fair Value Of Derivatives     11,000,000 4,000,000      
Unrealised loss on foreign exchange and other derivatives         (2,000,000)    
Net realized gains on foreign exchange and other derivatives     31,000,000 2,000,000 13,000,000    
Collateral provided     304,000,000 55,000,000      
Cash collateral     260,000,000 18,000,000      
Additional collateral requirement     $ 656,000,000 120,000,000      
Number Of Below Investment Grade Ratings From Credit Rating Agencies | agency     2     2  
Recourse Debt              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Debt maturing     $ 400,000,000        
Letter of credit              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Collateral posted on derivative liabilities     820,000,000 356,000,000      
Within one year              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
After-tax gain reclassified from AOCI to net earnings     $ (208,000,000)        
Long-term debt | Net investment hedges              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Notional amount           $ 370 $ 370
Interest rate swap              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Number of agreements | agreement     2        
Outstanding credit facilities     $ 433,000,000 0      
Bond Lock Agreement              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Notional amount             $ 150
Commodity Price Risk - Proprietary Trading              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Value at risk     4,000,000 2,000,000 1,000,000    
Commodity Price Risk - Generation              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Value at risk     97,000,000 33,000,000 12,000,000    
Commodity Price Risk - Generation - Mark To Market Value              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Value at risk     54,000,000 51,000,000 15,000,000    
Commodity Price Risk - Generation - virtual PPAs              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Value at risk     26,000,000 14,000,000 $ 3,000,000    
Interest rate risk | Interest rate swap              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Notional amount $ 100 $ 100       $ 150  
Interest rate risk | Interest rate swap | Fixed Blended Rate              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Fixed interest rate 470.00% 470.00%          
Interest rate risk | TAPC Holdings LP bond (Poplar Creek)              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Notional amount     95,000,000 $ 104,000,000      
Commodity risk management | Cash flow hedges              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Value at risk     $ 0