XML 187 R154.htm IDEA: XBRL DOCUMENT v3.24.0.1
Defined Benefit Obligation and Other Long-Term Liabilities - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 01, 2022
CAD ($)
Disclosure of fair value measurement of liabilities [line items]        
Increase (decrease) in defined benefit obligation $ 5      
Defined benefit obligation 155   $ 150  
Voluntary contribution $ 4 $ 3 35  
Increase in discount rates 100.00%      
Level II | Recurring fair value measurement        
Disclosure of fair value measurement of liabilities [line items]        
Commodity risk management assets and liabilities $ (244)   $ 173  
Level II | Recurring fair value measurement | retail power contract liabilities        
Disclosure of fair value measurement of liabilities [line items]        
Commodity risk management assets and liabilities       $ 129
Risk management assets | Level II | Recurring fair value measurement        
Disclosure of fair value measurement of liabilities [line items]        
Commodity risk management assets and liabilities       $ 139
Pro Forma        
Disclosure of fair value measurement of liabilities [line items]        
Increase (decrease) in defined benefit obligation $ 40