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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2017
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

2017

2016

2017

2016

2017

2016
Balance at January 1

$
251


$
239


$
69


$
254


$
320


$
493

Issuances/accruals during the period

251


228


1


—


252


228

Settlements made during the period/other

(226
)

(218
)

(70
)

(145
)

(296
)

(363
)
Balance at September 30

$
276


$
249


$
—


$
109


$
276


$
358




















Current portion

$
203


$
188


$
—


$
109


$
203


$
297

Non-current portion

73


61


—


—


73


61

Total

$
276


$
249


$
—


$
109


$
276


$
358