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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
Warranty Accrual Table
Below is a table that shows the activity in the warranty accrual accounts:
 
Year Ended
December 31,
 
2013
 
2012
 
2011
 
(Millions)
Beginning Balance
$
23

 
$
26

 
$
33

Accruals related to product warranties
20

 
15

 
11

Reductions for payments made
(19
)
 
(18
)
 
(18
)
Ending Balance
$
24

 
$
23

 
$
26