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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Goodwill impairment - Note G	$ 0	$ 0	$ 530	$ 0
Minimum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	1		1
Maximum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 3		$ 3
Current Fiscal Year [Member]
Income Tax Contingency [Line Items]
Effective tax rate (in hundredths)	19.00%		(4.00%)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount			$ 4
Nondeductible goodwill impairment			$ 527
Prior Fiscal Year [Member]
Income Tax Contingency [Line Items]
Effective tax rate (in hundredths)		(5.00%)		114.00%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount		$ 2		$ (17)

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