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Guarantees (Tables)
 9 Months Ended
Sep. 30, 2021
Service and Product Warranties and Product Performance Guarantees [Abstract]  
Schedule of guarantees As of September 30, 2021 and December 31, 2020, the following guarantees were outstanding:
September 30, 2021December 31, 2020
(dollars in millions)Maximum Potential PaymentCarrying Amount of LiabilityMaximum Potential PaymentCarrying Amount of Liability
Commercial aerospace financing arrangements$314 $6 $322 $6 
Third party guarantees376 2 386 3 
Product Warranty Disclosure [Table Text Block] The changes in the carrying amount of service and product warranties and product performance guarantees for the nine months ended September 30, 2021 and 2020 are as follows:
(dollars in millions)20212020
Balance as of January 1$1,057 $1,033 
Warranties and performance guarantees issued247 206 
Settlements(212)(229)
Other(3)(10)
Balance as of September 30$1,089 $1,000