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Financial Instruments and Risk Management - Offsetting Financial Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair value of derivative assets    
Financial Instruments and Risk Management    
Gross Assets $ 4,305 $ 6,527
Gross Liabilities Offset (4,162) (6,404)
Net Amounts Presented 143 123
Accounts receivables    
Financial Instruments and Risk Management    
Gross Assets 10,349 5,048
Gross Liabilities Offset (8,633) (2,734)
Net Amounts Presented 1,716 2,314
Financial assets    
Financial Instruments and Risk Management    
Gross Assets 14,654 11,575
Gross Liabilities Offset (12,795) (9,138)
Net Amounts Presented $ 1,859 $ 2,437