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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2021
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 dollars20212020
Earnings before income taxes$599 $222 
Income tax expense computed at United States statutory tax rate126 47 
Valuation allowances
U.S. foreign income items, net of credits
Other23 22 
Income tax expense (benefit) computed at effective worldwide tax rates$159 $73