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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Product Warranty Reserves
The following table summarizes the changes in total product warranty and legacy product warranty liability reserves for the periods presented:


Product Warranty

Legacy Product Warranty

Total
Millions of dollars

2018

2017

2018

2017

2018

2017
Balance at January 1

$
277


$
251


$
—


$
69


$
277


$
320

Issuances/accruals during the period

218


251


—


1


218


252

Settlements made during the period/other

(216
)

(226
)

—


(70
)

(216
)

(296
)
Balance at September 30

$
279


$
276


$
—


$
—


$
279


$
276

 
 
 
 
 
 
 
 
 
 
 
 
 
Current portion

$
204


$
203


$
—


$
—


$
204


$
203

Non-current portion

75


73


—


—


75


73

Total

$
279


$
276


$
—


$
—


$
279


$
276