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Warranty Obligations
 3 Months Ended
Mar. 31, 2015
Product Warranties Disclosures [Abstract]  
Warranty Obligations
Warranty Obligations
 
We record a liability for estimated warranty obligations at the dates our products are sold. We record the liability based on our estimate of costs to settle future claims. Adjustments are made as new information becomes available. Certain prior period amounts in the following table previously included in amounts accrued for current period sales have been reclassified to adjustments of prior period estimates.

Changes in warranty liabilities — 
 
Three Months Ended 
 March 31,
 
2015
 
2014
Balance, beginning of period
$
47

 
$
54

Amounts accrued for current period sales
7

 
4

Adjustments of prior estimates
2

 
4

Settlements of warranty claims
(8
)
 
(6
)
Currency impact
(2
)
 


Balance, end of period
$
46

 
$
56