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Additional Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	May 13, 2021
Dividends Payable [Line Items]
Interest payments	$ 28	$ 43	$ 92	$ 108
Income and withholding taxes paid	37	$ 18	89	58
Dividends paid	$ 62		$ 187	$ 281
Dividends paid (in dollars per share)	$ 0.12
Common Stock
Dividends Payable [Line Items]
Cash dividends declared (in dollars per share)					$ 0.12
Dividends paid (in dollars per share)			$ 0.36

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Aggregate dividends paid during the period for each share of common stock outstanding.

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