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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2020
Guarantees [Abstract]  
Schedule of Guarantor Obligations [Table Text Block] As of December 31, 2020 and 2019, the following financial guarantees were outstanding:
December 31, 2020December 31, 2019
(dollars in millions)Maximum
Potential
Payment		Carrying
Amount of
Liability		Maximum
Potential
Payment		Carrying
Amount of
Liability
Commercial aerospace financing guarantees$322 $6 $333 $7 
Performance guarantees386 3 48 — 
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, 2020 and 2019 are as follows:
(dollars in millions)20202019
Balance as of January 1$1,033 $929 
Warranties and performance guarantees issued311 444 
Settlements(292)(330)
Other5 (10)
Balance as of December 31$1,057 $1,033