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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 reconciliations of income tax expense with federal income taxes at the statutory rate are as follows (in millions of dollars):
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Federal income tax $67 $47 $139 $82 
States income taxes, net of federal income tax benefit18 11 
Stock compensation (6)— (7)(2)
Foreign rate difference13 
Net tax benefit related to foreign subsidiaries— (3)— (88)
Other, net— 
Income tax provision$76 $55 $164 $12 
Effective tax rate23.6 %30.2 %24.7 %3.9 %