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Pension and other postretirement benefits - Schedule of Pension Plans where Accumulated Benefit Obligation (“ABO”) Projected Benefit Obligation (“PBO”) Exceeds the Fair Value of Respective Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
United States | Pension Plans    
Pension plans with projected benefit obligations in excess of plan assets:    
Projected benefit obligation $ 464 $ 496
Fair value of plan assets 434 449
Plans with accumulated postretirement benefit obligations in excess of plan assets:    
Accumulated benefit obligation 464 496
Fair value of plan assets 434 449
United States | OPEB    
Plans with accumulated postretirement benefit obligations in excess of plan assets:    
Accumulated benefit obligation 0 0
Fair value of plan assets 0 0
Non-U.S. | Pension Plans    
Pension plans with projected benefit obligations in excess of plan assets:    
Projected benefit obligation 565 580
Fair value of plan assets 458 421
Plans with accumulated postretirement benefit obligations in excess of plan assets:    
Accumulated benefit obligation 147 527
Fair value of plan assets 61 394
Non-U.S. | OPEB    
Plans with accumulated postretirement benefit obligations in excess of plan assets:    
Accumulated benefit obligation 6 9
Fair value of plan assets $ 0 $ 0