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Income Taxes Deferred Taxes Classified in Consolidated Statements of Financial Position (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
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Income Tax Disclosure [Abstract] |  |
Other noncurrent assets | $ 552 | $ 1,265
Other noncurrent liabilities | (588) | (727)
Deferred Tax Liabilities, Net | $ (36) |
Net deferred tax asset |  | $ 538

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