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Income Taxes Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Beginning balance	$ 2,358	$ 2,161	$ 1,694
Additions for tax positions related to the current year	433	435	613
Additions for tax positions of prior years	347	7	116
Reductions for tax positions of prior years	(88)	(201)	(44)
Settlements with taxing authorities	0	(19)	(95)
Statute closings and audit resolutions	(599)	(25)	(264)
Acquisition of business	0	0	141
Ending balance	$ 2,451	$ 2,358	$ 2,161

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Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations and Audit Resolutions

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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