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Equity and Noncontrolling Interests - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stockholders' equity attributable to noncontrolling interest	$ 341
Dividends	(54)	$ (61)	$ (56)
Stockholders' equity attributable to noncontrolling interest	322	341
Redeemable noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stockholders' equity attributable to noncontrolling interest	51	47	28
Net income attributable to the entity	19	30	24
Foreign currency translation adjustments	(4)	3	1
Dividends	(23)	(29)	(7)
Change in noncontrolling interest share	0	0	1
Stockholders' equity attributable to noncontrolling interest	$ 43	$ 51	$ 47

X

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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Adjustments to temporary equity resulting from foreign currency translation adjustments.

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Value of new stock classified as temporary equity issued during the period.

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