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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, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Beginning balance	$ 1,706	$ 1,052	$ 1,493
Additions for tax positions related to the current year	613	442	329
Additions for tax positions of prior years	116	15	23
Reductions for tax positions of prior years	(44)	(66)	(111)
Settlements with taxing authorities	(95)	(104)	(541)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations and Audit Resolutions	264	30	141
Acquisition of business	141	397	0
Ending balance	$ 2,173	$ 1,706	$ 1,052

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

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