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Additional Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Feb. 11, 2021
Dividends Payable [Line Items]
Interest payments	$ 37	$ 21	$ 64	$ 65
Income and withholding taxes paid	35	$ 20	52	40
Dividends paid	$ 63		$ 125	$ 244
Common Stock
Dividends Payable [Line Items]
Cash dividends declared (in dollars per share)					$ 0.12
Dividends paid (in dollars per share)	$ 0.12		$ 0.24

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

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