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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Payment Under Operating Lease
Lease commitments — Cash obligations under future minimum rental commitments under operating leases and net rental expense are shown in the table below. Operating lease commitments are primarily related to facilities.
 
2014
 
2015
 
2016
 
2017
 
2018
 
Thereafter
 
Total
Lease commitments
$
59

 
$
33

 
$
25

 
$
18

 
$
15

 
$
51

 
$
201
Rent Expense
 
2013
 
2012
 
2011
Rent expense
$58
 
$63
 
$62