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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2021
Guarantees [Abstract]  
Schedule of Guarantor Obligations [Table Text Block] As of December 31, 2021 and 2020, the following financial guarantees were outstanding:
December 31, 2021December 31, 2020
(dollars in millions)Maximum
Potential
Payment		Carrying
Amount of
Liability		Maximum
Potential
Payment		Carrying
Amount of
Liability
Commercial aerospace financing guarantees$309 $3 $322 $6 
Third party guarantees511 5 386 3 
Product Warranty Disclosure [Table Text Block] The changes in the carrying amount of service and product warranties and product performance guarantees for the years ended December 31, 2021 and 2020 were as follows:
(dollars in millions)20212020
Balance as of January 1$1,057 $1,033 
Warranties and performance guarantees issued380 311 
Settlements(272)(292)
Other(8)5 
Balance as of December 31$1,157 $1,057