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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Total rent expense under operating leases
Total rent expense for the three years ended December 31, 2013 was as follows:
(in millions)
Total
2013
$
77

2012
73

2011
64
Minimum rental payments under operating leases
At December 31, 2013, we are obligated to make minimum rental payments under operating leases which are as follows:
(in millions)
2014
 
2015
 
2016
 
2017
 
2018
 
Thereafter
Minimum rental payments
$
63

 
$
51

 
$
39

 
$
24

 
$
22

 
$
26
Changes in product warranty accrual
The table below provides changes in the product warranty accrual over each period.
(in millions)
2013
 
2012
Warranty accrual – January 1
$
40

 
$
42

Net changes for product warranties in the period
34

 
32

Settlement of warranty claims
(37
)
 
(33
)
Other
—

 
(1
)
Warranty accrual – December 31
$
37

 
$
40