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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2019
Guarantees [Abstract]  
Schedule of Guarantor Obligations [Table Text Block] As of December 31, 2019 and 2018, the following financial guarantees were outstanding:
  December 31, 2019December 31, 2018
(dollars in millions)Maximum
Potential
Payment		Carrying
Amount of
Liability		Maximum
Potential
Payment		Carrying
Amount of
Liability
Commercial aerospace financing arrangements (see Note 4)$333  $7  $348  $9  
Credit facilities and debt obligations —  —  116  —  
Performance guarantees48  —  55  5  
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, 2019 and 2018 are as follows:
(dollars in millions)20192018
Balance as of January 1$1,449  $1,146  
Warranties and performance guarantees issued635  604  
Settlements made(512) (493) 
Other1
(24) 192  
Balance as of December 31$1,548  $1,449  
1 Other in 2018 is driven by the Rockwell Collins acquisition.