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Fair Value Measurements (Assets and Liabilities Not Measured at Fair Value ) (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value Measurement [Domain]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial assets and liabilities $ 14,670 $ 16,775
Fair Value Measurement [Domain] | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial assets and liabilities 0 0
Fair Value Measurement [Domain] | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial assets and liabilities 14,284 16,308
Fair Value Measurement [Domain] | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial assets and liabilities 386 467
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial assets and liabilities 16,318 14,658
Financial assets and liabilities $ 14,670 $ 16,775