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Discontinued Operations Discontinued Operations, Income Statement Disclosures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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	$ 0	$ 0	$ 0	$ 24
Income from discontinued operations	$ 0	$ 4,051	$ 0	4,574
Ireland statutory income tax rate		12.50%
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		$ 562		5,001
Income from discontinued operations before income taxes		5,315		6,039
Provision for income taxes on discontinued operations		(1,264)		(1,441)
Income from discontinued operations attributable to noncontrolling interests		0		(24)
Income from discontinued operations		4,051		4,574
Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		5,200		5,200
Proceeds from Divestiture of Businesses		13,200		13,200
Depreciation and Amortization, Discontinued Operations		21		117
Disposal Group, Discontinued Operations, Consideration, net		$ 11,600		$ 11,600

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