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Income Taxes Deferred Taxes Classified in Consolidated Statements of Financial Position (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
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Deferred Taxes [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance | $ 1,768 | $ 2,245
Deferred Tax Liabilities, Gross | 1,456 | 1,768
Net deferred tax asset | 312 | 477
Other noncurrent assets |  |
Deferred Taxes [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance | 755 | 862
Other Noncurrent Liabilities |  |
Deferred Taxes [Line Items] |  |
Deferred Tax Liabilities, Gross | $ 443 | $ 385

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