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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The following table summarizes the difference between income tax expense at the United States statutory rate of 35% and the income tax expense at effective worldwide tax rates for the respective periods:
 
 
Three Months Ended March 31,
Millions of dollars
 
2015
 
2014
Earnings before income taxes
 
$
207

 
$
214

 
 
 
 
 
Income tax expense computed at United States statutory tax rate
 
72

 
75

U.S. foreign income items, net of credits
 
(2
)
 
(12
)
Valuation allowance release
 
(58
)
 

Foreign government tax incentive (including BEFIEX in 2014)
 
(4
)
 
(5
)
Other
 
1

 
(8
)
Income tax expense computed at effective worldwide tax rates
 
$
9

 
$
50