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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Loss Contingencies by Contingency
The following table summarizes the activity in the Company’s accrued obligations for asbestos and other personal injury matters (in millions):
 
 
Three Months Ended September 30,
 
 
2018
 
2017
Beginning balance
 
$
295

 
$
364

Accruals / changes in estimates
 
22

 
(24
)
Payments
 
(16
)
 
(16
)
     Ending balance
 
$
301

 
$
324


 
 
Nine Months Ended September 30,
 
 
2018
 
2017
Beginning balance
 
$
307

 
$
367

Accruals / changes in estimates
 
56

 
(6
)
Payments
 
(62
)
 
(37
)
     Ending balance
 
$
301

 
$
324


    
Accrued Obligations for Environmental Matters
The following table summarizes the activity in the Company’s accrued obligations for environmental matters (in millions):
 
 
Three Months Ended September 30,
 
 
2018
 
2017
Beginning balance
 
$
310

 
$
326

Accruals / changes in estimates
 
(7
)
 
3

Payments
 
(4
)
 
(7
)
     Ending balance
 
$
299

 
$
322


 
 
Nine Months Ended September 30,
 
 
2018
 
2017
Beginning balance
 
$
317

 
$
342

Accruals / changes in estimates
 
(5
)
 
2

Payments
 
(13
)
 
(22
)
     Ending balance
 
$
299

 
$
322