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Income Taxes (Tables) | 9 Months Ended
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Jun. 30, 2020
Income Tax Disclosure [Abstract] |
Summary of Changes in Unrecognized Tax Benefits | Changes in unrecognized tax benefits are summarized as follows for the nine months ended June 30, 2020.
(In millions) |  |  |
Balance at October 1, 2019 | $ | 165 |
Increases related to positions taken on items from prior years |  | 2 |
Decreases related to positions taken on items from prior years |  | (1 | )
Increases related to positions taken in the current year |  | 4 |
Lapse of statute of limitations |  | (1 | )
Balance at June 30, 2020 | $ | 169 |

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