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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 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

145


158


—


1


145


159

Settlements made during the period/other

(147
)

(154
)

—


(47
)

(147
)

(201
)
Balance at June 30

$
275


$
255


$
—


$
23


$
275


$
278




















Current portion

$
200


$
189


$
—


$
23


$
200


$
212

Non-current portion

75


66


—


—


75


66

Total

$
275


$
255


$
—


$
23


$
275


$
278