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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Income tax benefit related to release of valuation allowance		$ 33
Income tax expense (benefit)	$ 51		$ (12)	$ 44	$ 86
U.S. federal corporate statutory tax rate				21.00%
Reasonably possible decrease in gross unrecognized tax benefits from ongoing audits and settlement	$ 2			$ 2
Foreign Tax Authority
Income Tax Contingency [Line Items]
Release of valuation allowance		$ 33

X

- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Tax Benefit Related to Release of Valuation Allowance

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