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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, 2023 | Dec. 31, 2022
United States |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 19 | $ 20
Actual return on plan assets, relating to assets still held at reporting date | 1 | 0
Purchases, sales and settlements | (1) | (1)
Transfer (out of) Level 3 | (15) |
Change due to exchange rate changes | 0 | 0
Fair value of plan assets at end of year | 4 | 19
United States | Investment funds |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 11 | 11
Actual return on plan assets, relating to assets still held at reporting date | 0 | 0
Purchases, sales and settlements | 0 | 0
Transfer (out of) Level 3 | (11) |
Change due to exchange rate changes | 0 | 0
Fair value of plan assets at end of year | 0 | 11
United States | Other |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 8 | 9
Actual return on plan assets, relating to assets still held at reporting date | 1 | 0
Purchases, sales and settlements | (1) | (1)
Transfer (out of) Level 3 | (4) |
Change due to exchange rate changes | 0 | 0
Fair value of plan assets at end of year | 4 | 8
Non-U.S. |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 132 | 174
Actual return on plan assets, relating to assets still held at reporting date | 13 | (31)
Purchases, sales and settlements | (10) | 0
Transfer (out of) Level 3 | 0 |
Change due to exchange rate changes | 4 | (11)
Fair value of plan assets at end of year | 139 | 132
Non-U.S. | Real estate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 13 | 17
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 | 1 | (2)
Fair value of plan assets at end of year | 14 | 13
Non-U.S. | Assets held by insurance company |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 113 | 152
Actual return on plan assets, relating to assets still held at reporting date | 11 | (31)
Purchases, sales and settlements | (10) | 0
Transfer (out of) Level 3 | 0 |
Change due to exchange rate changes | 3 | (8)
Fair value of plan assets at end of year | 117 | 113
Non-U.S. | Other |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 6 | 5
Actual return on plan assets, relating to assets still held at reporting date | 2 | 2
Purchases, sales and settlements | 0 | 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 | $ 6

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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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