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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Guarantee obligations [Table Text Block]
The maximum potential payments under guarantees and the carrying value of recorded liabilities related to guarantees were as follows(in millions):
 
March 31,
2012
 
December 31,
2011
Maximum potential payments
$
425

 
$
444

Carrying value of recorded liabilities related to guarantees
29

 
31

Warranty [Table Text Block]
Warranty accruals accounted for in Accrued liabilities and deferred revenue for the periods ended March 31 were as follows (in millions):
 
First Quarter
 
2012
 
2011
Beginning balance
$
3,915

 
$
3,855

Payments made during the period
(560
)
 
(783
)
Changes in accrual related to warranties issued during the period
526

 
500

Changes in accrual related to pre-existing warranties
26

 
132

Foreign currency translation and other
41

 
71

Ending balance
$
3,948

 
$
3,775