v3.25.4
Guarantees and product warranty - Product Warranty (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Movement in Standard Product Warranty Accrual    
Warranty liability, beginning of period $ 1,700 $ 1,894
Reduction in liability (payments) (836) (824)
Increase in liability (new warranties) 762 630
Warranty liability, end of period $ 1,626 $ 1,700