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Income Taxes Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Beginning balance		$ 2,528	$ 2,451	$ 2,358
Additions for tax positions related to the current year		240	128	433
Additions for tax positions of prior years		33	129	347
Reductions for tax positions of prior years		(6)	(27)	(88)
Settlements with taxing authorities		(24)	(54)	0
Statute closings and audit resolutions		(45)	(99)	(599)
Ending balance		2,726	2,528	2,451
Amount of unrecognized tax benefits which may impact effective tax rate		2,268	2,132	2,121
Total net accrued interest, net of tax benefit		$ 252	205	181
Unrecognized Tax Benefit Resulting From Tax Audit Resolution			$ 44
Tax Adjustments, Settlements, and Unusual Provisions				586
Release of tax indemnification reserve	$ 226			$ 226

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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