v3.26.1
Income and Other Taxes - Allocation of Income Tax Expense Benefit (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Interperiod Allocaion [Line Items]      
Income tax expense (benefit) on Loss before income taxes $ 541 $ 105 $ (29)
Changes in defined benefit plans      
Income Tax Interperiod Allocaion [Line Items]      
Other comprehensive income (loss), tax (23) (10) 93
Cash flow hedges      
Income Tax Interperiod Allocaion [Line Items]      
Other comprehensive income (loss), tax 1 (1) 1
Translation adjustments      
Income Tax Interperiod Allocaion [Line Items]      
Other comprehensive income (loss), tax 0 (8) 0
Additional Paid-in Capital      
Income Tax Interperiod Allocaion [Line Items]      
Other comprehensive income (loss), tax $ 0 $ 6 $ 0