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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Warranty Accrual Table
Below is a table that shows the activity in the warranty accrual accounts:
 
Year Ended
December 31,
 
2015
 
2014
 
2013
 
(Millions)
Beginning Balance
$
26

 
$
24

 
$
23

Accruals related to product warranties
15

 
24

 
20

Reductions for payments made
(18
)
 
(22
)
 
(19
)
Ending Balance
$
23

 
$
26

 
$
24