Equity and Noncontrolling Interests Changes in Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Beginning balance	$ 234
Spin-off of Adient	(246)	$ (192)	$ (365)
Ending balance	211	234
Redeemable Noncontrolling Interests
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Beginning balance	234	212	194
Net income	44	48	51
Foreign currency translation adjustments	13	2	(23)
Realized and unrealized gains (losses) on derivatives	(1)	(1)	1
Dividends	(43)	(27)	(11)
Spin-off of Adient	(36)	0	0
Ending balance	211	234	212
Parent
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Spin-off of Adient	$ 246	192	$ 365
Tyco Merger [Member]
Equity [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		$ 34

Equity [Line Items]

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- Definition

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

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No definition available.

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- Definition

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

+ References

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- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

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- Definition

This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.

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No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.27(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Adjustments to temporary equity resulting from foreign currency translation adjustments.

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