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Additional cash flow information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in liabilities arising from financing activities [abstract]    
Beginning balance $ 27,081  
Cash flows used in financing activities    
(Decrease) increase in notes payable (1,641) $ (1,073)
Issue of long-term debt 6,006 1,954
Repayment of long-term debt (5,003) (2,221)
Increase in securitized trade receivables 0 131
Cash dividends paid on common and preferred shares (3,107) (2,966)
Cash dividends paid by subsidiaries to non-controlling interests (53) (65)
Discontinued operations (7) (6)
Other financing activities (93) (54)
Total cash flows (used in) from financing activities excluding equity (3,888) (4,300)
Non-cash changes arising from    
Increase in lease liabilities 675 1,005
Dividends declared on common and preferred shares 3,147 3,008
Dividends declared by subsidiaries to non-controlling interests 53 64
Effect of changes in foreign exchange rates 0 0
Business acquisitions 7  
Discontinued operations (106) 1
Other 186 72
Total non-cash changes 3,962 4,150
Ending balance 27,155 27,081
Other financing activities (93) (54)
DEBT DUE WITHIN ONE YEAR AND LONG-TERM DEBT    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance 26,296  
Cash flows used in financing activities    
(Decrease) increase in notes payable (1,810) (1,045)
Issue of long-term debt 6,006 1,954
Repayment of long-term debt (5,003) (2,221)
Increase in securitized trade receivables   131
Cash dividends paid on common and preferred shares 0 0
Cash dividends paid by subsidiaries to non-controlling interests 0 0
Discontinued operations (7) (6)
Other financing activities (31) (34)
Total cash flows (used in) from financing activities excluding equity (845) (1,221)
Non-cash changes arising from    
Increase in lease liabilities 675 1,005
Dividends declared on common and preferred shares 0 0
Dividends declared by subsidiaries to non-controlling interests 0 0
Effect of changes in foreign exchange rates 159 (261)
Business acquisitions 7  
Discontinued operations (106) 1
Other 137 63
Total non-cash changes 872 808
Ending balance 26,323 26,296
Other financing activities (31) (34)
DERIVATIVE TO HEDGE FOREIGN CURRENCY ON DEBT    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance 56  
Cash flows used in financing activities    
(Decrease) increase in notes payable 169 (28)
Issue of long-term debt 0 0
Repayment of long-term debt 0 0
Increase in securitized trade receivables   0
Cash dividends paid on common and preferred shares 0 0
Cash dividends paid by subsidiaries to non-controlling interests 0 0
Discontinued operations 0 0
Other financing activities 0 0
Total cash flows (used in) from financing activities excluding equity 169 (28)
Non-cash changes arising from    
Increase in lease liabilities 0 0
Dividends declared on common and preferred shares 0 0
Dividends declared by subsidiaries to non-controlling interests 0 0
Effect of changes in foreign exchange rates (159) 261
Business acquisitions 0  
Discontinued operations 0 0
Other 0 (8)
Total non-cash changes (159) 253
Ending balance 66 56
Other financing activities 0 0
DIVIDENDS PAYABLE    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance 729  
Cash flows used in financing activities    
(Decrease) increase in notes payable 0 0
Issue of long-term debt 0 0
Repayment of long-term debt 0 0
Increase in securitized trade receivables   0
Cash dividends paid on common and preferred shares (3,107) (2,966)
Cash dividends paid by subsidiaries to non-controlling interests (53) (65)
Discontinued operations 0 0
Other financing activities 0 0
Total cash flows (used in) from financing activities excluding equity (3,160) (3,031)
Non-cash changes arising from    
Increase in lease liabilities 0 0
Dividends declared on common and preferred shares 3,147 3,008
Dividends declared by subsidiaries to non-controlling interests 53 64
Effect of changes in foreign exchange rates 0 0
Business acquisitions 0  
Discontinued operations 0 0
Other (3) (3)
Total non-cash changes 3,197 3,069
Ending balance 766 729
Other financing activities 0 0
OTHER LIABILITIES    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance 0  
Cash flows used in financing activities    
(Decrease) increase in notes payable 0 0
Issue of long-term debt 0 0
Repayment of long-term debt 0 0
Increase in securitized trade receivables   0
Cash dividends paid on common and preferred shares 0 0
Cash dividends paid by subsidiaries to non-controlling interests 0 0
Discontinued operations 0 0
Other financing activities (52) (20)
Total cash flows (used in) from financing activities excluding equity (52) (20)
Non-cash changes arising from    
Increase in lease liabilities 0 0
Dividends declared on common and preferred shares 0 0
Dividends declared by subsidiaries to non-controlling interests 0 0
Effect of changes in foreign exchange rates 0 0
Business acquisitions 0  
Discontinued operations 0 0
Other 52 20
Total non-cash changes 52 20
Ending balance 0 0
Other financing activities (52) (20)
TOTAL    
Cash flows used in financing activities    
Other financing activities (83)  
Non-cash changes arising from    
Other financing activities $ (83)  
Previously stated    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance   24,927
Previously stated | DEBT DUE WITHIN ONE YEAR AND LONG-TERM DEBT    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance   24,405
Previously stated | DERIVATIVE TO HEDGE FOREIGN CURRENCY ON DEBT    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance   (169)
Previously stated | DIVIDENDS PAYABLE    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance   691
Previously stated | OTHER LIABILITIES    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance   $ 0