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Income Taxes Uncertain Tax Position, Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Tax Adjustments, Settlements, and Unusual Provisions			$ 586
Release of tax indemnification reserve	$ (226)		(226)
Unrecognized Tax Benefits, Decrease (Increase) Resulting from Tax Audit Resolution				$ 25
Unrecognized Tax Benefits		$ 2,528	2,451	2,358	$ 2,161
Amount of unrecognized tax benefits which may impact effective tax rate		2,132	2,121	2,225
Total net accrued interest, net of tax benefit		205	181	119
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 0	$ 0	$ 108

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Amount of increase (decrease) in unrecognized tax benefits resulting from tax audit resolutions.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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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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Amount of unrecognized tax benefits.

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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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