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Risk Management Activities - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
agency
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2023
USD ($)
agency
Dec. 31, 2022
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Floating interest rates 14.00% 1500.00%   14.00% 1500.00%
Outstanding credit facilities $ (46,000,000) $ 449,000,000 $ (114,000,000)    
Target percentage, four year period 6000.00%        
Sensitivity analysis average $ 0.03 0.03 0.03    
Maximum credit exposure $ 23,000,000 64,000,000      
Number of credit rating agency | agency 1     1  
Debt maturing $ 400,000,000        
After-tax gain reclassified from AOCI to net earnings 102,000,000 (460,000,000) (222,000,000)    
Net unrealized gain 44,000,000 384,000,000 97,000,000    
Gains on foreign exchange and other derivatives 11,000,000 20,000,000 6,000,000    
Unrealised Gains On Change In Fair Value Of Derivatives (27,000,000)   (4,000,000)    
Unrealised loss on foreign exchange and other derivatives   11,000,000      
Net realised loss on change in fair value of derivatives 16,000,000        
Net realized gains on foreign exchange and other derivatives   31,000,000 2,000,000    
Collateral provided 145,000,000 304,000,000      
Cash collateral 9,000,000 260,000,000      
Additional collateral requirement $ 154,000,000 594,000,000      
Number Of Below Investment Grade Ratings From Credit Rating Agencies | agency 2     2  
Trade and other receivables $ 807,000,000 1,589,000,000      
Recourse Debt          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Debt maturing 411,000,000        
Letter of credit          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Collateral posted on derivative liabilities 392,000,000 820,000,000      
Surety Bonds          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Collateral posted on derivative liabilities 19,000,000 6,000,000      
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 (89,000,000)        
Within one year | Lease Incentive Receivable          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Trade and other receivables 12,000,000        
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 contract [member]          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Outstanding credit facilities 400,000,000 433,000,000      
Commodity Price Risk - Proprietary Trading          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Value at risk 4,000,000 4,000,000 2,000,000    
Commodity Price Risk - Generation          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Value at risk 23,000,000 97,000,000 33,000,000    
Commodity Price Risk - Generation - Mark To Market Value          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Value at risk 16,000,000 45,000,000 $ 34,000,000    
Interest rate risk | TAPC Holdings LP bond (Poplar Creek)          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Notional amount 86,000,000 $ 95,000,000      
Commodity risk management | Cash flow hedges          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Value at risk $ 0