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Equity and Noncontrolling Interests Changes in Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Realized and unrealized gains (losses) on derivatives	$ 6	$ (29)	$ (14)
Spin-off of Adient	(230)	(117)	(246)
Redeemable Noncontrolling Interests
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Beginning balance	0	211	234
Net income		35	44
Foreign currency translation adjustments		(3)	13
Realized and unrealized gains (losses) on derivatives		(9)	(1)
Dividends		(3)	(43)
Noncontrolling Interest, Change in Redemption Value		(231)	0
Spin-off of Adient		0	(36)
Ending balance		0	211
Parent
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Realized and unrealized gains (losses) on derivatives	7	(19)	(14)
Noncontrolling Interest, Change in Redemption Value		0
Spin-off of Adient	$ 230	$ 117	$ 246

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- Definition

Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]

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Decrease in redeemable noncontrolling interest balance from payment of dividends or other distributions to redeemable noncontrolling interest holders.

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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

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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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Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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Adjustments to temporary equity resulting from foreign currency translation adjustments.

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