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Employee benefit plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Health care benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 0 $ 0 $ 0 $ 0 $ 0
Interest cost 1 1 2 3 4
Expected return on assets (2) (2) (3) (6) (7)
Other 1 1 (2) 3 (6)
Net periodic benefit (credit) cost 0 0 (3) 0 (9)
Domestic | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 0 0 0 0 0
Interest cost 46 46 46 138 137
Expected return on assets (90) (91) (96) (272) (286)
Other 8 8 6 24 18
Net periodic benefit (credit) cost (36) (37) (44) (110) (131)
Foreign | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 6 0 3 9 9
Interest cost 10 11 10 31 29
Expected return on assets (19) (20) (21) (58) (60)
Other (1) (1) (1) (3) (3)
Net periodic benefit (credit) cost $ (4) $ (10) $ (9) $ (21) $ (25)