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Equity and Noncontrolling Interests - Changes in Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]
Realized and unrealized gains (losses) on derivatives	$ (9)	$ 1	$ 10	$ (10)
Parent
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]
Realized and unrealized gains (losses) on derivatives	$ (5)	3	$ 10	(2)
Redeemable Noncontrolling Interests [Member]
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]
Beginning balance		231		231	$ 235	$ 211
Net income		10		35
Foreign currency translation adjustments		(13)		(3)
Realized and unrealized gains (losses) on derivatives		(1)		(9)
Dividends				(3)
Ending balance		$ 231		$ 231	$ 235	$ 211

X

- Definition

Decrease in redeemable noncontrolling interest balance from payment of dividends or other distributions to redeemable 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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- Definition

Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Adjustments to temporary equity resulting from foreign currency translation adjustments.

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