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Leases (Tables)
 9 Months Ended
Sep. 30, 2025
Leases [Abstract]  
Lease cost and other information
The components of lease expense were as follows:
Three Months EndedThree Months EndedNine Months EndedNine Months Ended
(DOLLARS IN MILLIONS)September 30, 2025September 30, 2024September 30, 2025September 30, 2024
Operating leases
Operating lease cost$32 $31 $90 $95 
Variable lease cost11 14 43 42 
Total operating lease cost$43 $45 $133 $137 
Finance leases
Finance lease cost$4 $3 $10 $9 
Supplemental cash flow information related to leases was as follows:
Nine Months EndedNine Months Ended
(DOLLARS IN MILLIONS)September 30, 2025September 30, 2024
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases$99 $90 
Operating cash flows for finance leases1 1 
Financing cash flows for finance leases9 7 
Right-of-use assets obtained in exchange for lease obligations
Operating leases84 44 
Finance leases14 12