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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The following table summarizes the difference between income tax expense (benefit) at the U.S. statutory rate of 21% and 35%, respectively, and the income tax expense (benefit) at effective worldwide tax rates for the respective periods:


Three Months Ended September 30,

Nine Months Ended September 30,
Millions of dollars

2018

2017

2018

2017
Earnings (loss) before income taxes

$
223


$
268


$
(277
)

$
678










Income tax (benefit) expense computed at United States statutory tax rate

47


94


(58
)

237

Valuation allowances (releases)

4


(84
)

43


(77
)
U.S. transition tax
 
78

 
—

 
78

 
—

U.S. foreign income items, net of credits

(108
)

(17
)

(146
)

(70
)
Changes in enacted rates
 
(54
)
 
—

 
(54
)
 
—

Non deductible impairments
 
—

 
—

 
138

 
—

Non deductible government payments
 
—

 
—

 
37

 
—

Other

40


3


14


(21
)
Income tax (benefit) expense computed at effective worldwide tax rates

$
7


$
(4
)

$
52


$
69