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Income Taxes (Tables)
 9 Months Ended
Sep. 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 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 September 30,

Nine Months Ended September 30,
Millions of dollars

2014

2013

2014

2013
Earnings before income taxes

$
261


$
254


$
710


$
689

Income tax expense computed at United States statutory tax rate

$
91


$
89


$
249


$
241

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

—


(16
)

—


(127
)
U.S. foreign income items, net of credits
 
(34
)
 
3

 
(59
)
 
(19
)
Valuation allowance release

(25
)

—


(38
)

—

Foreign government tax incentive, including BEFIEX

(10
)

(16
)

(20
)

(45
)
Other

4


(5
)

(6
)

(23
)
Income tax expense computed at effective worldwide tax rates

$
26


$
55


$
126


$
27