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Income Taxes Components of Provision for Income Taxes on Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Components of Income Tax [Line Items]
Income from Continuing Operations before Income Taxes, Domestic		$ (259)	$ 261	$ 335
Current
U.S. federal		(1,025)	476	(286)
U.S. state		(33)	26	(18)
Non-U.S.		213	434	53
Total		(845)	936	(251)
Deferred
U.S. federal		412	(372)	523
U.S. state		84	(10)	33
Non-U.S.		116	(357)	17
Total		612	(739)	573
Income tax provision		(233)	197	322
Income from Continuing Operations before Income Taxes, Foreign		1,315	1,285	816
Income Taxes Paid		377	81	497
Taxes Payable, Current		159	336
Undistributed Earnings of Foreign Subsidiaries		20,100
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ (76)	$ (284)	$ 31	$ (164)

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