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Cash Flow Information Changes in Liabilities from Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period $ 4,150 $ 3,575
Cash issuances 173 1,153
Repayments and dividends paid (301) (706)
New leases 1 16
Dividends declared 90 107
Foreign exchange impact (39) 5
Other (10) 0
Balance at end of the period 4,064 4,150
Long-term debt and lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 3,361 3,212
Cash issuances 173 753
Repayments and dividends paid (214) (620)
New leases 1 16
Dividends declared 0 0
Foreign exchange impact (39) 5
Other (15) (5)
Balance at end of the period 3,267 3,361
Exchangeable securities (Note 25)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 730 326
Cash issuances 0 400
Repayments and dividends paid 0 0
New leases 0 0
Dividends declared 0 0
Foreign exchange impact 0 0
Other 5 4
Balance at end of the period 735 730
Dividends payable (common and preferred)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 59 37
Cash issuances 0 0
Repayments and dividends paid (87) (86)
New leases 0 0
Dividends declared 90 107
Foreign exchange impact 0 0
Other 0 1
Balance at end of the period $ 62 $ 59