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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 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 six months ended June 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

159


141


—


—


159


141

Settlements made during the period/other

(153
)

(149
)

(101
)

—


(254
)

(149
)
Balance at June 30

$
245


$
227


$
153


$
—


$
398


$
227




















Current portion

$
186


$
176


$
131


$
—


$
317


$
176

Non-current portion

59


51


22


—


81


51

Total

$
245


$
227


$
153


$
—


$
398


$
227