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Income Taxes Deferred Taxes Classified in Consolidated Statements of Financial Position (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	$ 862	$ 552
Deferred Tax Liabilities, Net, Noncurrent	385	588
Deferred Tax Assets (Liabilities), Net	$ 477
Deferred Income Tax Liabilities, Net		$ (36)

X

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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