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Additional Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Nov. 13, 2020
Dividends Payable [Line Items]
Interest payments	$ 27	$ 44
Income and withholding taxes paid	17	20
Dividends paid	$ 62	$ 206
Common Stock
Dividends Payable [Line Items]
Cash dividends declared (in dollars per share)			$ 0.12

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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