Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities at Fair Value

:

	As of September 30, 2021
(In millions)	Total		Level 1		Level 2		Level 3		NAV (a)
Cash and cash equivalents
Money market funds	$	13	$	13	$	—	$	—	$	—
Time deposits	87		—		87		—		—
Prepaid expenses and other current assets
Currency derivatives	3		—		3		—		—
Other noncurrent assets
Non-qualified trust funds	11		—		4		—		7
Interest rate swap agreements	2				2
Total assets at fair value	$	116	$	13	$	96	$	—	$	7
Accrued expenses and other liabilities
Currency derivatives	$	3	$	—	$	3	$	—	$	—
Interest rate swap agreements	1		—		1		—		—
Other noncurrent liabilities
Deferred compensation obligations	24		—		—		—		24
Total liabilities at fair value	$	28	$	—	$	4	$	—	$	24
	As of September 30, 2020
(In millions)	Total		Level 1		Level 2		Level 3		NAV (a)
Cash and cash equivalents
Money market funds	$	296	$	296	$	—	$	—	$	—
Time deposits	139		—		139		—		—
Prepaid expenses and other current assets
Currency derivatives	3		—		3		—		—
Other noncurrent assets
Non-qualified trust funds	16		—		8		—		8
Total assets at fair value	$	454	$	296	$	150	$	—	$	8
Accrued expenses and other liabilities
Currency derivatives	$	2	$	—	$	2	$	—	$	—
Interest rate swap agreements	1		—		1		—		—
Other noncurrent liabilities
Deferred compensation obligations	25		—		—		—		25
Total liabilities at fair value	$	28	$	—	$	3	$	—	$	25

(a)Funds measured at fair value using the NAV per share practical expedient have not been classified in the fair value hierarchy.

Summary of Fair Value of Debt

	September 30, 2021						September 30, 2020
(In millions)	Fair value		Carrying value (a)		Unamortized discounts and issuance costs		Fair value		Carrying value (a)		Unamortized discounts and issuance costs
2025 Notes	$	—	$	—	$	—	$	827	$	790	$	(10)
2030 Notes	622		593		(7)		613		592		(8)
2031 Notes	531		529		(6)		—		—		—
Total	$	1,153	$	1,122	$	(13)	$	1,440	$	1,382	$	(18)

(a)Carrying values shown are net of unamortized discounts and issuance costs.