v3.22.4
Income Taxes (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]        
Income taxes receivable, CARES Act     $ 213  
Income tax recovery, CARES Act     141  
Future taxable income to realize deferred income tax assets $ 2,300      
Unrecognized deferred income tax asset on unrealized foreign exchange loss recorded in AOCI 196 $ 264    
Gross unrecognized tax benefits 52 64 92 $ 62
Net unrecognized tax benefits at end of year 38 47 67  
Unrecognized tax benefits that would impact effective tax rate 15      
Approximate amount of unrecognized tax benefits that may be recognised over the next 12 months as a result of settlements and a lapse of the applicable statute of limitations 12      
Tax recovery 12 2    
Recognized accrued interest and penalties     16  
Accrued interest and penalties 13 25    
Deferred tax expense     $ 25  
Deferred tax recovery $ 13 $ 8