Discontinued Operations Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Assets and Liabilities Held for Sale [Line Items]
Assets held for sale	$ 189	$ 5,812
Noncurrent assets held for sale	1,920	7,374
Assets held for sale	2,109	13,186	$ 10,613
Current portion of long-term debt	0	38
Long-term debt	0	3,441
Noncurrent liabilities held for sale	173	3,888
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Security business in South Africa [Member]
Assets and Liabilities Held for Sale [Line Items]
Accounts receivable - net		9
Inventories		7
Other current assets		3
Property, plant and equipment - net		15
Goodwill		89
Other intangible assets - net		30
Other noncurrent assets		4
Assets held for sale		157
Accounts payable		9
Other current liabilities		19
Liabilities held for sale		28
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Adient
Assets and Liabilities Held for Sale [Line Items]
Cash		105
Cash in escrow related to Adient debt		2,034
Accounts receivable - net		2,071
Inventories		672
Other current assets		756
Assets held for sale		5,638
Property, plant and equipment - net		2,240
Goodwill		2,385
Other intangible assets - net		113
Investments in partially owned affiliates		1,745
Other noncurrent assets		891
Noncurrent assets held for sale		7,374
Short term debt		41
Current portion of long-term debt		38
Accounts payable		2,764
Accrued compensation and benefits		430
Other current liabilities		975
Liabilities held for sale		4,248
Long-term debt		3,441
Pension and postretirement benefits		188
Other noncurrent iabilities		259
Noncurrent liabilities held for sale		3,888
Corporate | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets and Liabilities Held for Sale [Line Items]
Assets held for sale		$ 17
Global Products | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Scott Safety business [Member]
Assets and Liabilities Held for Sale [Line Items]
Cash	9
Accounts receivable - net	100
Inventories	75
Other current assets	5
Assets held for sale	189
Property, plant and equipment - net	79
Goodwill	1,248
Other intangible assets - net	592
Other noncurrent assets	1
Noncurrent assets held for sale	1,920
Accounts payable	37
Accrued compensation and benefits	10
Other current liabilities	25
Liabilities held for sale	72
Other noncurrent iabilities	173
Noncurrent liabilities held for sale	$ 173