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

 
$
1,468

Warranties and performance guarantees issued
159

 
156

Settlements made
(132
)
 
(152
)
Other
—

 
(341
)
Balance as of June 30
$
1,359

 
$
1,131