v3.26.1
Accumulated other comprehensive loss - Schedule of Amounts Reclassified From AOCI to Net Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of revenues: $ 1,967 $ 1,859
Income tax benefit (27) (46)
Other non-operating income, net (1) (1)
Total amounts reclassified from Accumulated other comprehensive loss to Net loss 118 87
Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total amounts reclassified from Accumulated other comprehensive loss to Net loss 0 (2)
Net change in fair value of effective portion of cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of revenues: 2 (1)
Income tax benefit 0 0
Total amounts reclassified from Accumulated other comprehensive loss to Net loss 2 (1)
Actuarial losses and prior service costs for defined benefit pension plans and other postretirement benefit plans | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income tax benefit 0 0
Other non-operating income, net (2) (1)
Total amounts reclassified from Accumulated other comprehensive loss to Net loss $ (2) $ (1)