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INCOME TAXES (Tables)
3 Months Ended
Mar. 31, 2022
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 dollars20222021
Earnings before income taxes$427 $599 
Income tax expense computed at United States statutory tax rate90 126 
Valuation allowances7 
U.S. foreign income items, net of credits(8)
Other17 23 
Income tax expense (benefit) computed at effective worldwide tax rates$106 $159