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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six Months Ended June 30,
Millions of dollars
 
2016
 
2015
 
2016
 
2015
Earnings before income taxes
 
$
286

 
$
275

 
$
501

 
$
482

 
 
 
 
 
 
 
 
 
Income tax (benefit) expense computed at United States statutory tax rate
 
100

 
96

 
175

 
169

Valuation allowance releases
 
(105
)
 
—

 
(105
)
 
(58
)
Audits and settlements
 
(32
)
 
2

 
(32
)
 
1

U.S. foreign income items, net of credits
 
(6
)
 
(11
)
 
(11
)
 
(13
)
Foreign government tax incentive
 
(2
)
 
(4
)
 
(4
)
 
(8
)
Other
 
(11
)
 
7

 
(20
)
 
8

Income tax (benefit) expense computed at effective worldwide tax rates
 
$
(56
)
 
$
90

 
$
3

 
$
99