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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Statement of Comprehensive Income [Abstract] |  |  |
Net of tax | $ 1 | $ 3 | $ 8

X
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