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Environmental Matters, Litigation and Product Warranties (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
(Millions)
Beginning Balance January 1,
$
26

 
$
20

Accruals related to product warranties
8

 
11

Reductions for payments made
(5
)
 
(4
)
Ending Balance June 30,
$
29

 
$
27