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Guarantees (Tables)
3 Months Ended
Mar. 31, 2020
Service and Product Warranties and Product Performance Guarantees [Abstract]  
Product Warranty Disclosure [Table Text Block] The changes in the carrying amount of service and product warranties and product performance guarantees for the quarters ended March 31, 2020 and 2019 are as follows:
(dollars in millions)20202019
Balance as of January 1$1,548  $1,449  
Warranties and performance guarantees issued133  137  
Settlements made(129) (110) 
Other(16)  
Balance as of March 31$1,536  $1,485