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Income Taxes (Tables)
6 Months Ended
Jun. 30, 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 June 30, Six Months Ended June 30,
Millions of dollars2021202020212020
Earnings before income taxes$674 $37 $1,273 $258 
Income tax expense computed at United States statutory tax rate142 267 54 
Valuation allowances(1)2 
Audit and Settlements8 15 17 
U.S. foreign income items, net of credits (2)7 
Changes in enacted tax rates(14)— (14)— 
Divestiture tax impact(21)— (21)— 
Legal entity restructuring tax impact(46)— (46)— 
Other26 43 11 
Income tax expense (benefit) computed at effective worldwide tax rates$94 $17 $253 $89