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Pension and other postretirement benefits - Schedule of Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2024
USD ($)
OPEB  
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 6
2026 6
2027 6
2028 6
2029 6
2030-2034 32
Employer contributions 6
United States | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2025 37
2026 37
2027 37
2028 37
2029 36
2030-2034 175
Employer contributions 2
Non-U.S. | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2025 117
2026 115
2027 116
2028 114
2029 115
2030-2034 593
Employer contributions $ 36