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Accumulated other comprehensive loss - Schedule of Amounts Reclassified From AOCI to Net Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total cost of revenues $ 2,254 $ 2,264 $ 4,113 $ 4,158
Income tax (benefit) expense 122 149 76 138
Net income (428) (473) (341) (429)
Other non-operating income, net (1) 0 (2) (4)
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net income (3) (8) (5) 5
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]        
Total cost of revenues (3) (13) (4) 6
Income tax (benefit) expense 1 5 1 0
Net income (2) (8) (3) 6
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) expense 0 0 0 0
Net income (1) 0 (2) (1)
Other non-operating income, net $ (1) $ 0 $ (2) $ (1)