Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						$ 197	$ 183	$ 181
2016 Restructuring Plan [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges	$ 110	$ 51	$ 29			190
2016 Restructuring Plan [Member] | Power Solutions
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						64
2016 Restructuring Plan [Member] | Building Efficiency Other
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						3
2016 Restructuring Plan [Member] | Corporate
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						55
2016 Restructuring Plan [Member] | Automotive Experience Seating
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						55
2016 Restructuring Plan [Member] | Building Efficiency Products North America [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						8
2016 Restructuring Plan [Member] | Building Efficiency Asia
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						4
2016 Restructuring Plan [Member] | Automotive Experience Interiors
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges						$ 1
2015 Restructuring Plan [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges							183
2015 Restructuring Plan [Member] | Building Efficiency Other
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges							16
2015 Restructuring Plan [Member] | Building Efficiency Systems and Service North America [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges							1
2015 Restructuring Plan [Member] | Corporate
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges							139
2015 Restructuring Plan [Member] | Automotive Experience Seating
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges							$ 27
2014 Restructuring Plan
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				$ 46	$ 45			91
2014 Restructuring Plan | Building Efficiency Other
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges								34
2014 Restructuring Plan | Corporate
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges								5
2014 Restructuring Plan | Automotive Experience Seating
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges								7
2014 Restructuring Plan | Automotive Experience Interiors
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges								$ 45
2014 Restructuring Plan | Discontinued Operations | Automotive Experience Electronics
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					$ 43