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Income Taxes (Tables)
9 Months Ended
Jun. 30, 2019
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 ended June 30Nine months ended June 30
(In millions)2019201820192018
Income tax expense$20 $33 $56 $154 
Effective tax rate percentage23.5 %34.0 %23.6 %56.0 %