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Income Taxes (Tables)
9 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense and Effective Tax Rate The following summarizes income tax expense and the effective tax rate in each interim period:
Three months endedNine months ended
June 30June 30
(In millions)2021202020212020
Income tax expense$31 $19 $83 $68 
Effective tax rate percentage24.2 %24.4 %24.8 %25.9 %