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Pension and other postretirement benefits - Schedule of Level 3 Reconciliation for Pension Plans by Asset (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
United States |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 4 | $ 19
Actual return on plan assets, relating to assets still held at reporting date | 0 | 1
Purchases, sales and settlements | 0 | (1)
Transfer out of Level 3 | (2) | (15)
Change due to exchange rate changes | 0 |
Fair value of plan assets at end of year | 2 | 4
United States | Investment funds |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 | 11
Actual return on plan assets, relating to assets still held at reporting date |  | 0
Purchases, sales and settlements |  | 0
Transfer out of Level 3 |  | (11)
Fair value of plan assets at end of year |  | 0
United States | Other |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 4 | 8
Actual return on plan assets, relating to assets still held at reporting date | 0 | 1
Purchases, sales and settlements | 0 | (1)
Transfer out of Level 3 | (2) | (4)
Change due to exchange rate changes | 0 |
Fair value of plan assets at end of year | 2 | 4
Non-U.S. |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 139 | 132
Actual return on plan assets, relating to assets still held at reporting date | 6 | 13
Purchases, sales and settlements | (15) | (10)
Transfer out of Level 3 | 0 |
Change due to exchange rate changes | (9) | 4
Fair value of plan assets at end of year | 121 | 139
Non-U.S. | Real estate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 14 | 13
Actual return on plan assets, relating to assets still held at reporting date | 0 | 0
Purchases, sales and settlements | (6) | 0
Transfer out of Level 3 | 0 |
Change due to exchange rate changes | 0 | 1
Fair value of plan assets at end of year | 8 | 14
Non-U.S. | Assets held by insurance company |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 117 | 113
Actual return on plan assets, relating to assets still held at reporting date | 6 | 11
Purchases, sales and settlements | (9) | (10)
Transfer out of Level 3 | 0 |
Change due to exchange rate changes | (9) | 3
Fair value of plan assets at end of year | 105 | 117
Non-U.S. | Other |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 8 | 6
Actual return on plan assets, relating to assets still held at reporting date | 0 | 2
Purchases, sales and settlements | 0 | 0
Transfer out of Level 3 | 0 |
Change due to exchange rate changes | 0 | 0
Fair value of plan assets at end of year | $ 8 | $ 8

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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