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Income Taxes (Tables)
9 Months Ended
Sep. 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 September 30, Nine Months Ended September 30,
Millions of dollars2021202020212020
Earnings before income taxes$586 $534 $1,859 $793 
Income tax expense computed at United States statutory tax rate123 112 390 167 
State and local taxes, net of federal tax benefit17 15 49 22 
Valuation allowances3 5 12 
Audit and settlements(32)14 (17)31 
U.S. foreign income items, net of credits(1)(2)(1)(1)
Changes in enacted tax rates (6)(14)(6)
Divestiture tax impact(1)— (22)— 
Legal entity restructuring tax impact — (46)— 
Other(9)9 
Income tax expense (benefit) computed at effective worldwide tax rates$100 $141 $353 $231