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Other Financial Information (Accrued Expenses) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Sep. 30, 2017
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Accrued Liabilities and Other Liabilities [Abstract] |  |
Employee compensation | $ 578 | $ 531
Customer advanced payments | 503 | 505
Product warranty | $ 122 | $ 120

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