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Derivatives Instruments (Credit Risk) (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Days
Dec. 31, 2021
CAD ($)
Credit Derivatives [Line Items]    
Total cash deposits/collateral on hand $ 224 $ 212
Financial Asset, Past Due [Member]    
Credit Derivatives [Line Items]    
Financial assets, considered to be past due 131 114
Credit Concentration Risk    
Credit Derivatives [Line Items]    
Concentration Risk, maximum exposure 1,900 1,300
Total cash deposits/collateral on hand 386 341
Credit Concentration Risk | Receivables, net    
Credit Derivatives [Line Items]    
Fair Value, Financial assets, considered to be past due $ 114 $ 93
Average number of days financial asset outstanding | Days 60