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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The following table summarizes the difference between income tax expense (benefit) at the United States statutory rate of 35% and the income tax expense (benefit) at effective worldwide tax rates for the respective periods:


Three Months Ended June 30,

Six Months Ended June 30,
Millions of dollars

2014

2013

2014

2013
Earnings before income taxes

$
235


$
245


$
449


$
435

Income tax expense computed at United States statutory tax rate

$
82


$
85


$
157


$
152

U.S. government tax incentives, including Energy Tax Credits

—


(17
)

—


(111
)
U.S. foreign income items, net of credits
 
(13
)
 
—

 
(25
)
 
(22
)
Foreign government tax incentive, including BEFIEX

(5
)

(18
)

(11
)

(28
)
Other

(14
)

(11
)

(21
)

(19
)
Income tax expense (benefit) computed at effective worldwide tax rates

$
50


$
39


$
100


$
(28
)