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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The following table summarizes the difference between income tax (benefit) expense at the U.S. statutory rate of 21% and 35%, respectively, and the income tax (benefit) expense at effective worldwide tax rates for the respective periods:


Three Months Ended March 31,
Millions of dollars

2018

2017
Earnings before income taxes

$
109


$
198






Income tax expense computed at United States statutory tax rate

23


69

U.S. foreign income items, net of credits

(11
)

(19
)
Foreign government tax incentive



(2
)
Other

3


(8
)
Income tax expense computed at effective worldwide tax rates

$
15


$
40