SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Allowance for doubtful accounts
Valuation and Qualifying Account
Balance at beginning of year	$ 42	$ 32	$ 35
Charged (credited) to costs and expenses	36	32	29
Other	(25)	(22)	(32)
Balance at end of year	53	42	32
Deferred tax assets valuation allowance
Valuation and Qualifying Account
Balance at beginning of year	105	91	117
Charged (credited) to costs and expenses	23	0	(26)
Other	10	14	0
Balance at end of year	$ 138	$ 105	$ 91