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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2016
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 nine months ended September 30, 2016 and 2015:


Product Warranty

Legacy Product Warranty

Total
Millions of dollars

2016

2015

2016

2015

2016

2015
Balance at January 1

$
239


$
235


$
254


$
—


$
493


$
235

Issuances/accruals during the period

228


200


—


274


228


474

Settlements made during the period/other

(218
)

(203
)

(145
)

—


(363
)

(203
)
Balance at September 30

$
249


$
232


$
109


$
274


$
358


$
506




















Current portion

$
188


$
180


$
109


$
146


$
297


$
326

Non-current portion

61


52


—


128


61


180

Total

$
249


$
232


$
109


$
274


$
358


$
506