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Environmental Matters, Litigation and Product Warranties (Tables)
 3 Months Ended
Mar. 31, 2018
Environmental Matters, Litigation and Product Warranties [Abstract]  
Warranty Accrual Rollforward
Below is a table that shows the activity in the warranty accrual accounts:
 
Three Months Ended March 31,
 
2018
 
2017
 
(Millions)
Beginning Balance January 1,
$
26

 
$
20

Accruals related to product warranties
6

 
3

Reductions for payments made
(3
)
 
(3
)
Ending Balance March 31,
$
29

 
$
20