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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2016
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
 
2016
 
2015
Earnings before income taxes
 
$
215

 
$
207

 
 
 
 
 
Income tax expense computed at United States statutory tax rate
 
75

 
72

Valuation allowance releases
 

 
(58
)
U.S. foreign income items, net of credits
 
(5
)
 
(2
)
Foreign government tax incentive
 
(2
)
 
(4
)
Other
 
(9
)
 
1

Income tax expense computed at effective worldwide tax rates
 
$
59

 
$
9