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Environmental Matters, Litigation and Product Warranties (Tables)
 6 Months Ended
Jun. 30, 2015
Environmental Matters, Litigation and Product Warranties [Abstract]  
Warranty Accrual Rollforward
Below is a table that shows the activity in the warranty accrual accounts:
 
Six Months Ended June 30,
 
2015
 
2014
 
(Millions)
Beginning Balance January 1,
$
26

 
$
24

Accruals related to product warranties
6

 
12

Reductions for payments made
(7
)
 
(10
)
Ending Balance June 30,
$
25

 
$
26