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Guarantees (Tables)
9 Months Ended
Sep. 30, 2020
Guarantees and Product Warranties [Abstract]  
Product Warranty Disclosure The changes in the carrying amount of service and product guarantees for the nine months ended September 30, 2020 and 2019 are as follows:
(dollars in millions)20202019
Balance as of January 1$27 $47 
Warranties8 
Settlements made(10)(16)
Other(1)(11)
Balance as of September 30$24 $27