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Employee benefit plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The components of net periodic benefit (credit) cost are presented below. The service cost component is reflected in staff expense, whereas the remaining components are reflected in other expense.
Net periodic benefit (credit) cost | Quarter ended
Sept. 30, 2025 |  | June 30, 2025 |  | Sept. 30, 2024
(in millions) | Domestic pension benefits | Foreign pension benefits | Health care benefits |  | Domestic pension benefits | Foreign pension benefits | Health care benefits |  | Domestic pension benefits | Foreign pension benefits | Health care benefits
Service cost | $ | — |  | $ | 6 |  | $ | — |  |  | $ | — |  | $ | — |  | $ | — |  |  | $ | — |  | $ | 3 |  | $ | — |
Interest cost | 46 |  | 10 |  | 1 |  |  | 46 |  | 11 |  | 1 |  |  | 46 |  | 10 |  | 2 |
Expected return on assets | (90) |  | (19) |  | (2) |  |  | (91) |  | (20) |  | (2) |  |  | (96) |  | (21) |  | (3) |
Other | 8 |  | (1) |  | 1 |  |  | 8 |  | (1) |  | 1 |  |  | 6 |  | (1) |  | (2) |
Net periodic benefit (credit) | $ | (36) |  | $ | (4) |  | $ | — |  |  | $ | (37) |  | $ | (10) |  | $ | — |  |  | $ | (44) |  | $ | (9) |  | $ | (3) |
Net periodic benefit (credit) cost | Year-to-date
| Sept. 30, 2025 |  | Sept. 30, 2024
(in millions) | Domestic pension benefits | Foreign pension benefits | Health care benefits |  | Domestic pension benefits | Foreign pension benefits | Health care benefits
Service cost | $ | — |  | $ | 9 |  | $ | — |  |  | $ | — |  | $ | 9 |  | $ | — |
Interest cost | 138 |  | 31 |  | 3 |  |  | 137 |  | 29 |  | 4 |
Expected return on assets | (272) |  | (58) |  | (6) |  |  | (286) |  | (60) |  | (7) |
Other | 24 |  | (3) |  | 3 |  |  | 18 |  | (3) |  | (6) |
Net periodic benefit (credit) | $ | (110) |  | $ | (21) |  | $ | — |  |  | $ | (131) |  | $ | (25) |  | $ | (9) |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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