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Guarantees (Tables)
 9 Months Ended
Sep. 30, 2013
Notes to Condensed Consolidated Financial Statements [Abstract]  
Product Warranty Disclosure [Text Block]
(Dollars in millions)
 
2013
 
2012
Balance as of January 1
 
$
1,332

 
$
1,468

Warranties and performance guarantees issued
 
232

 
235

Settlements made
 
(223
)
 
(217
)
Other
 
22

 
(165
)
Balance as of September 30
 
$
1,363

 
$
1,321