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Additional cash flow information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Changes in liabilities arising from financing activities [abstract]    
Beginning balance $ 37,012 $ 32,733
Cash flow used in financing activities    
Increase in notes payable 1,945 (646)
Issue of long-term debt 3,834 5,195
Repayment of supplier finance arrangements (78) (81)
Repayment of long-term debt (3,225) (1,777)
Repurchase of financial liability 0 (149)
Cash dividends paid on common and preferred shares (3,800) (3,668)
Cash dividends paid by subsidiaries to non-controlling interests (68) (47)
Other financing activities (31) (24)
Total cash flows from (used in) financing activities excluding equity (1,423) (1,197)
Non-cash changes arising from    
Increase in lease liabilities 774 1,562
Dividends declared on common and preferred shares 3,827 3,717
Dividends declared by subsidiaries to non-controlling interests 68 47
Effect of changes in foreign exchange rates 0 0
Business acquisitions 120 5
Business disposition   (93)
Reclassification to liabilities held for sale (10) (7)
Additions to supplier finance arrangements 58 68
Other 41 177
Total non-cash changes 4,878 5,476
Ending balance 40,467 37,012
Debt due within one year and long-term debt    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance 36,177 31,920
Cash flow used in financing activities    
Increase in notes payable 1,817 (646)
Issue of long-term debt 3,834 5,195
Repayment of supplier finance arrangements (78) (81)
Repayment of long-term debt (3,289) (1,777)
Repurchase of financial liability   0
Cash dividends paid on common and preferred shares 0 0
Cash dividends paid by subsidiaries to non-controlling interests 0 0
Other financing activities (27) (24)
Total cash flows from (used in) financing activities excluding equity 2,257 2,667
Non-cash changes arising from    
Increase in lease liabilities 774 1,562
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 987 (169)
Business acquisitions 120 5
Business disposition   (93)
Reclassification to liabilities held for sale (10) (7)
Additions to supplier finance arrangements 58 68
Other 141 224
Total non-cash changes 2,070 1,590
Ending balance 40,504 36,177
Derivative to hedge foreign currency on debt    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance (153) (307)
Cash flow used in financing activities    
Increase in notes payable 128 0
Issue of long-term debt 0 0
Repayment of supplier finance arrangements 0 0
Repayment of long-term debt 64 0
Repurchase of financial liability   0
Cash dividends paid on common and preferred shares 0 0
Cash dividends paid by subsidiaries to non-controlling interests 0 0
Other financing activities 0 0
Total cash flows from (used in) financing activities excluding equity 192 0
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 (987) 169
Business acquisitions 0 0
Business disposition   0
Reclassification to liabilities held for sale 0 0
Additions to supplier finance arrangements 0 0
Other (27) (15)
Total non-cash changes (1,014) 154
Ending balance (975) (153)
Dividends payable    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance 910 867
Cash flow used in financing activities    
Increase in notes payable 0 0
Issue of long-term debt 0 0
Repayment of supplier finance arrangements 0 0
Repayment of long-term debt 0 0
Repurchase of financial liability   0
Cash dividends paid on common and preferred shares (3,800) (3,668)
Cash dividends paid by subsidiaries to non-controlling interests (68) (47)
Other financing activities 0 0
Total cash flows from (used in) financing activities excluding equity (3,868) (3,715)
Non-cash changes arising from    
Increase in lease liabilities 0 0
Dividends declared on common and preferred shares 3,827 3,717
Dividends declared by subsidiaries to non-controlling interests 68 47
Effect of changes in foreign exchange rates 0 0
Business acquisitions 0 0
Business disposition   0
Reclassification to liabilities held for sale 0 0
Additions to supplier finance arrangements 0 0
Other (4) (6)
Total non-cash changes 3,891 3,758
Ending balance 933 910
Other liabilities    
Changes in liabilities arising from financing activities [abstract]    
Beginning balance 78 253
Cash flow used in financing activities    
Increase in notes payable 0 0
Issue of long-term debt 0 0
Repayment of supplier finance arrangements 0 0
Repayment of long-term debt 0 0
Repurchase of financial liability   (149)
Cash dividends paid on common and preferred shares 0 0
Cash dividends paid by subsidiaries to non-controlling interests 0 0
Other financing activities (4) 0
Total cash flows from (used in) financing activities excluding equity (4) (149)
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 0
Business disposition   0
Reclassification to liabilities held for sale 0 0
Additions to supplier finance arrangements 0 0
Other (69) (26)
Total non-cash changes (69) (26)
Ending balance $ 5 $ 78