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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Product Warranty Reserves
The following table summarizes the changes in total product warranty reserves for the periods presented:
 
 
Six Months Ended June 30,
Millions of dollars

2015

2014
Balance at January 1

$
235


$
191

Issuances/accruals during the period

141


134

Settlements made during the period

(149
)

(143
)
Balance at June 30

$
227


$
182

 
 
 
 
 
Current portion

$
176


$
143

Non-current portion

51


39

Total

$
227


$
182