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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Product Warranty Reserves
The following table summarizes the changes in total product warranty reserves for the periods presented:
 
 
Three Months Ended March 31,
Millions of dollars

2015

2014
Balance at January 1

$
235


$
191

Issuances/accruals during the period

62


63

Settlements made during the period

(75
)

(74
)
Balance at March 31

$
222


$
180

 
 
 
 
 
Current portion

$
172


$
143

Non-current portion

50


37

Total

$
222


$
180