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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 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

158


159


1


—


159


159

Settlements made during the period/other

(154
)

(153
)

(47
)

(101
)

(201
)

(254
)
Balance at June 30

$
255


$
245


$
23


$
153


$
278


$
398




















Current portion

$
189


$
186


$
23


$
131


$
212


$
317

Non-current portion

66


59


—


22


66


81

Total

$
255


$
245


$
23


$
153


$
278


$
398