Acquisitions and Divestitures - Fair Value Allocation (Details) - USD ($) $ in Millions			12 Months Ended
	Sep. 30, 2021	Mar. 12, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Goodwill	$ 2,212		$ 2,057	$ 2,212	$ 2,057
Total purchase consideration		$ 271
Net cash paid			$ 19	211	$ 0
CQADNT
Business Acquisition [Line Items]
Cash	55			55
Accounts receivable	296			296
Inventory	37			37
Property, plant and equipment	86			86
Other assets	39			39
Goodwill	181			181
Intangible assets	234			234
Accounts payable	(252)			(252)
Other liabilities	(121)			(121)
Subtotal	555			555
Less: Interest already owned	103
Less: Redeemable noncontrolling interest	194			194
Total purchase consideration	258
Less: cash acquired	55
Net cash paid	203
LFADNT
Business Acquisition [Line Items]
Cash	5			5
Accounts receivable	2			2
Inventory	5			5
Property, plant and equipment	8			8
Other assets	2			2
Goodwill	8			8
Intangible assets	6			6
Accounts payable	(19)			(19)
Other liabilities	(4)			(4)
Subtotal	13			13
Less: Interest already owned	0
Less: Redeemable noncontrolling interest	0			$ 0
Total purchase consideration	13
Less: cash acquired	5
Net cash paid	$ 8