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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2013
Effective Income Tax Rate Reconciliation, Amount [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 periods presented:


Three Months Ended September 30,

Nine Months Ended September 30,
Millions of dollars

2013

2012

2013

2012
Earnings before income taxes

$
254


$
127


$
689


$
384

Income tax expense computed at United States statutory tax rate

$
89


$
44


$
241


$
134

U.S. government tax incentive - Energy Tax Credits

(15
)



(115
)


Valuation allowance release







(55
)
Foreign government tax incentive - BEFIEX

(7
)

(4
)

(24
)

(11
)
Other

(12
)

7


(75
)

19

Income tax expense computed at effective worldwide tax rates

$
55


$
47


$
27


$
87