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Income Taxes (Tables)
3 Months Ended
Dec. 31, 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 December 31
(In millions)20192018
Income tax expense$24  $19  
Effective tax rate percentage24.7 %26.4 %