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Environmental Matters, Litigation and Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2016
Environmental Matters, Litigation and Product Warranties [Abstract]  
Warranty Accrual Rollforward
Below is a table that shows the activity in the warranty accrual accounts:
 
Nine Months Ended September 30,
 
2016
 
2015
 
(Millions)
Beginning Balance January 1,
$
23

 
$
26

Accruals related to product warranties
6

 
11

Reductions for payments made
(10
)
 
(13
)
Ending Balance September 30,
$
19

 
$
24