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Income Taxes (Tables)
6 Months Ended
Mar. 31, 2020
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 endedSix months ended
March 31March 31
(In millions)2020201920202019
Income tax expense$25  $17  $49  $36  
Effective tax rate percentage28.4 %21.3 %26.5 %23.7 %