v3.26.1
other comprehensive income (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Items that may subsequently be reclassified to income        
Total, net $ (112) $ (3) $ (112) $ (14)
Cumulative foreign currency translation adjustment, accumulated balance, beginning of period 191 229 150 169
Cumulative foreign currency translation adjustment, amount arising 62 (78) 103 (18)
Cumulative foreign currency translation adjustment, income taxes     0  
Cumulative foreign currency translation adjustment, net 62 (78) 103 (18)
Cumulative foreign currency translation adjustment, accumulated balance, end of period 253 151 253 151
Item never reclassified to income        
Change in measurement of investment financial assets, accumulated balance, beginning of period 59 62 64 58
Unrealized gains (losses), amount arising (3) 1 (3) 3
Realized gains (losses), amount arising 1 3 (5) 6
Realized gains (losses), income taxes   1 (1) 2
Gains (losses) from change in measurement of investment financial assets, amount arising (2) 4 (8) 9
Gains (losses) from change in measurement of investment financial assets, income taxes   1 (1) 2
Gains (losses) from change in measurement of investment financial assets, net (2) 3 (7) 7
Change in measurement of investment financial assets, accumulated balance, end of period 57 65 57 65
Accumulated other comprehensive income (loss), beginning of period 40 19 4 (34)
Accumulated other comprehensive income (loss), amount arising (87) (57) (52) 2
Accumulated other comprehensive income (loss), income taxes (35) 21 (36) 27
Accumulated other comprehensive income (loss), net (52) (78) (16) (25)
Accumulated other comprehensive income (loss), end of period (12) (59) (12) (59)
Employee defined benefit plan re-measurements, amount arising (1) 36 16 35
Employee defined benefit plan re-measurements, income taxes   9 4 9
Employee defined benefit plan re-measurements, net (1) 27 12 26
Other comprehensive income, amount arising (88) (21) (36) 37
Other comprehensive income, income taxes (35) 30 (32) 36
Total (53) (51) (4) 1
Derivative assets        
Items that may subsequently be reclassified to income        
Change in unrealized fair value of derivatives designated as cash flow hedges, accumulated balance, beginning of period (210) (272) (210) (261)
Unrealized gains (losses) arising, amount arising 75 (308) 250 (306)
Realized (gains) losses reclassified to net income, amount arising (222) 325 (397) 317
Total, amount arising (147) 17 (147) 11
Total, income taxes (35) 20 (35) 25
Total, net (112) (3) (112) (14)
Change in unrealized fair value of derivatives designated as cash flow hedges, accumulated balance, end of period (322) (275) (322) (275)
Derivative assets | Currency risk        
Items that may subsequently be reclassified to income        
Change in unrealized fair value of derivatives designated as cash flow hedges, accumulated balance, beginning of period (194) (256) (214) (260)
Unrealized gains (losses) arising, amount arising 67 (343) 268 (323)
Unrealized gains (losses) arising, income taxes (4) (41) 29 (30)
Realized (gains) losses reclassified to net income, amount arising (220) 326 (394) 320
Realized (gains) losses reclassified to net income, income taxes (33) 52 (59) 51
Total, amount arising (153) (17) (126) (3)
Total, income taxes (37) 11 (30) 21
Total, net (116) (28) (96) (24)
Change in unrealized fair value of derivatives designated as cash flow hedges, accumulated balance, end of period (310) (284) (310) (284)
Derivative assets | Other market risk        
Items that may subsequently be reclassified to income        
Change in unrealized fair value of derivatives designated as cash flow hedges, accumulated balance, beginning of period (16) (16) 4 (1)
Unrealized gains (losses) arising, amount arising 8 35 (18) 17
Unrealized gains (losses) arising, income taxes 3 9 (4) 5
Realized (gains) losses reclassified to net income, amount arising (2) (1) (3) (3)
Realized (gains) losses reclassified to net income, income taxes (1)   (1) (1)
Total, amount arising 6 34 (21) 14
Total, income taxes 2 9 (5) 4
Total, net 4 25 (16) 10
Change in unrealized fair value of derivatives designated as cash flow hedges, accumulated balance, end of period (12) 9 (12) 9
Common Shares        
Item never reclassified to income        
Accumulated other comprehensive income (loss), beginning of period 40 (61) 4 (105)
Accumulated other comprehensive income (loss), end of period $ (12) (85) (12) (85)
Total     $ (4) 46
Non-controlling interests        
Item never reclassified to income        
Accumulated other comprehensive income (loss), beginning of period   80   71
Accumulated other comprehensive income (loss), end of period   $ 26   26
Total       $ (45)