Discontinued Operations Discontinued Operations, Income Statement Disclosures (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations attributable to noncontrolling interests	$ 15	$ 13
Income from discontinued operations	$ 248	$ 305
U.S. federal statutory income tax rate	12.50%	12.50%
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 76
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	2,427	$ 2,130
Income from discontinued operations before income taxes	390	368
Provision for income taxes on discontinued operations	(127)	(50)
Income from discontinued operations attributable to noncontrolling interests	(15)	(13)
Income from discontinued operations	248	$ 305
Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation costs	28
Depreciation and Amortization, Discontinued Operations	32
Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	13,200
Disposal Group, Discontinued Operations, Consideration, net	$ 11,400