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Pension and other postretirement benefits - Schedule of Funded Status of Plans and Amounts Recognized (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plans | U.S. |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 496 | $ 497 |
Service cost | 2 | 1 | $ 2
Interest cost | 24 | 24 | 18
Amendments | 0 | 0 |
Actuarial (gains) and losses | (24) | 9 |
Benefits paid | (34) | (35) |
Plan participant contributions | 0 | 0 |
Curtailments | 0 | 0 |
Settlements | 0 | 0 |
Net transfer in/(out) (including the effect of any business combinations/divestitures) | 0 | 0 |
Foreign currency rate changes | 0 | 0 |
Benefit obligation at end of year | 464 | 496 | 497
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 449 | 446 |
Actual gain on plan assets | 17 | 37 |
Employer contributions | 2 | 1 |
Plan participant contributions | 0 | 0 |
Benefits paid | (34) | (35) |
Settlements | 0 | 0 |
Net transfer in (including effect of any business combinations/divestitures) | 0 | 0 |
Foreign currency rate changes | 0 | 0 |
Fair value of plan assets at end of year | 434 | 449 | 446
Reconciliation of funded status: |  |  |
Fair value of plan assets | 434 | 449 | 446
Benefit obligation | 464 | 496 | 497
Funded status | (30) | (47) |
Accumulated Benefit Obligation | 464 | 496 |
Amounts recognized in the Consolidated Balance Sheets: |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (2) | (2) |
Noncurrent liabilities | (28) | (45) |
Liabilities held for sale | 0 | 0 |
Funded status at end of year | (30) | (47) |
Accumulated other comprehensive loss |  |  |
Net actuarial (gain) loss | (45) | (68) |
Prior service cost (credit) | (1) | (1) |
Total accumulated other comprehensive (loss) income | (46) | (69) |
Pension Plans | Non-U.S. |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 2,414 | 2,105 |
Service cost | 39 | 31 | 55
Interest cost | 81 | 86 | 43
Amendments | 0 | (1) |
Actuarial (gains) and losses | (28) | 178 |
Benefits paid | (104) | (89) |
Plan participant contributions | 10 | 9 |
Curtailments | (4) | 0 |
Settlements | (7) | (4) |
Net transfer in/(out) (including the effect of any business combinations/divestitures) | 27 | 0 |
Foreign currency rate changes | (145) | 99 |
Benefit obligation at end of year | 2,283 | 2,414 | 2,105
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,524 | 2,316 |
Actual gain on plan assets | 77 | 143 |
Employer contributions | 36 | 38 |
Plan participant contributions | 10 | 9 |
Benefits paid | (104) | (89) |
Settlements | (7) | (4) |
Net transfer in (including effect of any business combinations/divestitures) | 82 | 0 |
Foreign currency rate changes | (155) | 111 |
Fair value of plan assets at end of year | 2,463 | 2,524 | 2,316
Reconciliation of funded status: |  |  |
Fair value of plan assets | 2,463 | 2,524 | 2,316
Benefit obligation | 2,283 | 2,414 | 2,105
Funded status | 180 | 110 |
Accumulated Benefit Obligation | 2,231 | 2,349 |
Amounts recognized in the Consolidated Balance Sheets: |  |  |
Noncurrent assets | 290 | 271 |
Current liabilities | (4) | (4) |
Noncurrent liabilities | (106) | (111) |
Liabilities held for sale | 0 | (46) |
Funded status at end of year | 180 | 110 |
Accumulated other comprehensive loss |  |  |
Net actuarial (gain) loss | (190) | (225) |
Prior service cost (credit) | 74 | 92 |
Total accumulated other comprehensive (loss) income | (116) | (133) |
OPEB |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 105 | 100 |
Service cost | 3 | 2 | 3
Interest cost | 5 | 5 | 3
Amendments | 0 | 0 |
Actuarial (gains) and losses | (10) | 3 |
Benefits paid | (5) | (5) |
Plan participant contributions | 0 | 0 |
Curtailments | 0 | 0 |
Settlements | 0 | 0 |
Net transfer in/(out) (including the effect of any business combinations/divestitures) | (1) | 0 |
Foreign currency rate changes | (2) | 0 |
Benefit obligation at end of year | 95 | 105 | 100
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual gain on plan assets | 0 | 0 |
Employer contributions | 5 | 5 |
Plan participant contributions | 0 | 0 |
Benefits paid | (5) | (5) |
Settlements | 0 | 0 |
Net transfer in (including effect of any business combinations/divestitures) | 0 | 0 |
Foreign currency rate changes | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | 0
Reconciliation of funded status: |  |  |
Fair value of plan assets | 0 | 0 | 0
Benefit obligation | 95 | 105 | $ 100
Funded status | (95) | (105) |
Accumulated Benefit Obligation |  |  |
Amounts recognized in the Consolidated Balance Sheets: |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (6) | (6) |
Noncurrent liabilities | (89) | (98) |
Liabilities held for sale | 0 | (1) |
Funded status at end of year | (95) | (105) |
Accumulated other comprehensive loss |  |  |
Net actuarial (gain) loss | 42 | 35 |
Prior service cost (credit) | 2 | 3 |
Total accumulated other comprehensive (loss) income | 44 | 38 |
OPEB | Non-U.S. |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 11 |  |
Benefit obligation at end of year | 8 | 11 |
Reconciliation of funded status: |  |  |
Benefit obligation | $ 8 | $ 11 |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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