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Warranty Obligations (Tables)
 3 Months Ended
Mar. 31, 2014
Product Warranties Disclosures [Abstract]  
Changes in Warranty Liabilities
Changes in warranty liabilities — 
 
Three Months Ended March 31,
 
2014
 
2013
Balance, beginning of period
$
54

 
$
66

Amounts accrued for current period sales
8

 
6

Settlements of warranty claims
(6
)
 
(9
)
Balance, end of period
$
56

 
$
63