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Commitments (Tables)
 9 Months Ended
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]  
Changes in warranty liabilities
Changes in the company’s warranty liability for standard warranties, which are included in other accrued expenses and liabilities and other liabilities in the Consolidated Balance Sheet, are presented in the following table. The company's extended warranty liability, which is included in deferred income in the Consolidated Balance Sheet, was not material for the periods presented.
Standard Warranty Liability
(Dollars in millions)20252024
Balance at January 1$76 $65 
Current-period accruals55 53 
Accrual adjustments to reflect actual experience19 7 
Charges incurred(63)(61)
Balance at September 30$87 $64