Discontinued Operations Discontinued Operations, Income Statement Disclosures (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Apr. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations attributable to noncontrolling interests	$ 9		$ 11	$ 24	$ 24
Income from discontinued operations	$ 275		254	$ 523	$ 559
U.S. federal statutory income tax rate	12.50%			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	$ 2,012		1,845	$ 4,439	$ 3,975
Income from discontinued operations before income taxes	334		307	724	675
Provision for income taxes on discontinued operations	(50)		(42)	(177)	(92)
Income from discontinued operations attributable to noncontrolling interests	(9)		(11)	(24)	(24)
Income from discontinued operations	275		$ 254	523	$ 559
Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	13,200			13,200
Separation costs	18			46
Depreciation and Amortization, Discontinued Operations	$ 64			$ 96
Subsequent Event [Member] | Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Discontinued Operations, Consideration, net						$ 11,600