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Segment Information - Long-Lived Assets and Revenue by Geographical Areas (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 5,919 | $ 5,301 | $ 4,463
Long-lived Assets | 641 | 632 |
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 2,744 | 2,363 | 1,934
Long-lived Assets | 468 | 439 |
United Kingdom |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 734 | 620 | 551
Long-lived Assets | 30 | 43 |
Germany |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 613 | 662 | 511
Long-lived Assets | 68 | 52 |
All other territories |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,828 | 1,656 | $ 1,467
Long-lived Assets | $ 75 | $ 98 |

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