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Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Current |  |  |
Current income tax expense (benefit) | $ 90 | $ 122 | $ 136
Deferred |  |  |
Deferred income tax expense (benefit) | (33) | 288 | 344
Income tax provision | 57 | 410 | 480
Foreign tax authority | Ireland |  |  |
Current |  |  |
Current foreign tax expense | 0 | 0 | 1
Deferred |  |  |
Deferred foreign tax expense | 0 | 0 | 0
Income tax provision | 57 | 410 | 480
Foreign tax authority | Other Foreign |  |  |
Current |  |  |
Current foreign tax expense | 91 | 118 | 128
Deferred |  |  |
Deferred foreign tax expense | (33) | 287 | (73)
United States |  |  |
Current |  |  |
US - Federal and State | (1) | 4 | 7
Deferred |  |  |
US - Federal and State | $ 0 | $ 1 | $ 417

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