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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Release of valuation allowance	$ 33
Income tax benefit related to release of valuation allowance				$ 33
Income tax expense (benefit)		$ 41	$ 51		$ 127	$ 44
Reasonably possible decrease in gross unrecognized tax benefits from ongoing audits and settlement		$ 2			$ 2

X

- Definition

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

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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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