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Accumulated other comprehensive loss - Reclassification out of accumulated other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other nonoperating (expense) income, net $ (20) $ 161
Income tax benefit (58) (19)
Total (94) 116
Reclassifications from Accumulated other comprehensive loss to income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total (9) 23
Reclassifications from Accumulated other comprehensive loss to income | Cash flow hedges    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of product revenues (2) 30
Income tax benefit 0 (4)
Total (2) 26
Reclassifications from Accumulated other comprehensive loss to income | Pension and other postretirement plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other nonoperating (expense) income, net (8) (4)
Income tax benefit 1 1
Total $ (7) $ (3)