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Pension and other postretirement benefits - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
OPEB Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial (loss) gain | $ 3 | $ (32) | $ (19)
Prior service cost (credit) | 0 | 0 | (1)
Amortization or curtailment recognition of prior service (cost) credit | 0 | 0 | 1
Amortization or settlement recognition of net (loss) gain | 3 | 0 | 0
Foreign currency exchange effects | 0 | 0 | 0
Total accumulated other comprehensive (loss) income | 6 | (32) | (19)
Amount recognized in net periodic pension benefit cost (income) and other comprehensive (income) loss | 9 | (26) | (12)
United States | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial (loss) gain | (8) | (1) | (7)
Prior service cost (credit) | 0 | 2 | 1
Amortization or curtailment recognition of prior service (cost) credit | 0 | (4) | 0
Amortization or settlement recognition of net (loss) gain | (3) | (2) | (21)
Foreign currency exchange effects | 0 | 0 | 0
Total accumulated other comprehensive (loss) income | (11) | (5) | (27)
Amount recognized in net periodic pension benefit cost (income) and other comprehensive (income) loss | (3) | (9) | (21)
Non-U.S. | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial (loss) gain | 126 | (292) | (181)
Prior service cost (credit) | (1) | (2) | (1)
Amortization or curtailment recognition of prior service (cost) credit | 11 | 11 | 11
Amortization or settlement recognition of net (loss) gain | (4) | (13) | (27)
Foreign currency exchange effects | (2) | (27) | (29)
Total accumulated other comprehensive (loss) income | 130 | (323) | (227)
Amount recognized in net periodic pension benefit cost (income) and other comprehensive (income) loss | 150 | (295) | (179)
Non-U.S. | OPEB Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total accumulated other comprehensive (loss) income | $ 1 | $ (2) | $ (2)

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