XML 41 R27.htm IDEA: XBRL DOCUMENT v3.7.0.1
Income Taxes (Tables)
3 Months Ended
Mar. 31, 2017
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 March 31,
Millions of dollars
2017

2016
Earnings before income taxes
$
198


$
215





Income tax expense computed at United States statutory tax rate
69


75

U.S. foreign income items, net of credits
(19
)

(5
)
Foreign government tax incentive
(2
)

(2
)
Other
(8
)

(9
)
Income tax expense computed at effective worldwide tax rates
$
40


$
59