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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2020
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 the income tax expense (benefit) at effective worldwide tax rates for the respective periods:

Three Months Ended March 31,
Millions of dollars
2020
 
2019
Earnings (loss) before income taxes
$
219


$
342





Income tax expense (benefit) computed at United States statutory tax rate
46

 
72

Valuation allowances
1

 
(235
)
U.S. foreign income items, net of credits
3

 
7

Other
22

 
24

Income tax expense (benefit) computed at effective worldwide tax rates
$
72


$
(132
)