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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2017
Guarantees [Abstract]  
Schedule of Guarantor Obligations [Table Text Block]
As of December 31, 2017 and 2016, the following financial guarantees were outstanding:
  
December 31, 2017
 
December 31, 2016
(dollars in millions)
Maximum
Potential
Payment

 
Carrying
Amount of
Liability

 
Maximum
Potential
Payment

 
Carrying
Amount of
Liability

Commercial aerospace financing arrangements (see Note 5)
$
336

 
$
8

 
$
348

 
$
14

Credit facilities and debt obligations (expire 2018 to 2028)
256

 
15

 
270

 
15

Performance guarantees
56

 
2

 
55

 
4
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, 2017 and 2016 are as follows:
(dollars in millions)
2017
 
2016
Balance as of January 1
$
1,199

 
$
1,212

Warranties and performance guarantees issued
323

 
246

Settlements made
(207
)
 
(240
)
Other
9

 
(19
)
Balance as of December 31
$
1,324

 
$
1,199