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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)

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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_135_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_91_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of reclassification adjustments related to cash flow hedges, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 92 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_92&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2025-01-01 -Paragraph 6.5.11 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_6.5.11&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition A component of equity representing exchange differences on translation of financial statements recognised in other comprehensive income and accumulated in equity. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2025-01-01 -Paragraph 52 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2025-en-r&anchor=para_52_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 218 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_218_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 218 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_218_b&doctype=Standard -URIDate 2025-03-27 + Details
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