Consolidated Statement of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Operating activities:
Net income	$ 749,000,000	$ 948,000,000	$ 1,278,000,000
Adjustments to arrive at cash provided by operating activities
Depreciation	173,000,000	162,000,000	134,000,000
Amortization of intangible assets	152,000,000	155,000,000	116,000,000
Change in fair value of investments	3,000,000	0	(279,000,000)
Share-based compensation expense	85,000,000	100,000,000	88,000,000
Retirement benefit expense	43,000,000	18,000,000	126,000,000
Pension contributions	(88,000,000)	(27,000,000)	(26,000,000)
Deferred income taxes	(114,000,000)	(68,000,000)	(100,000,000)
Net loss on disposition and impairment of property	13,000,000	0	1,000,000
Accounting method change for net legacy asbestos-related defense costs	91,000,000	0	0
Goodwill and intangible asset impairment	224,000,000	0	158,000,000
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency adjustments
Receivables	(117,000,000)	405,000,000	(369,000,000)
Inventories	55,000,000	132,000,000	(296,000,000)
Accounts payable	53,000,000	(291,000,000)	70,000,000
Contract liabilities	39,000,000	(7,000,000)	107,000,000
Compensation and benefits	168,000,000	(255,000,000)	209,000,000
Income taxes	(54,000,000)	(237,000,000)	104,000,000
Other assets and liabilities	69,000,000	(171,000,000)	53,000,000
Cash provided by operating activities	1,544,000,000	864,000,000	1,374,000,000
Investing activities:
Capital expenditures	(186,000,000)	(225,000,000)	(161,000,000)
Acquisition of businesses, net of cash acquired	0	(749,000,000)	(168,000,000)
Purchases of investments	(14,000,000)	(10,000,000)	(27,000,000)
Proceeds from sale of investments	0	0	1,210,000,000
Other investing activities	(16,000,000)	2,000,000	0
Cash (used for) provided by investing activities	(216,000,000)	(982,000,000)	854,000,000
Financing activities:
Net (repayment) issuance of short-term debt	(134,000,000)	655,000,000	(257,000,000)
Issuance of short-term debt, net of issuance costs	513,000,000	19,000,000	0
Issuance of long-term debt, net of discount and issuance costs	14,000,000	0	0
Repayment of short-term debt	(500,000,000)	0	(19,000,000)
Repayment of long-term debt	(303,000,000)	0	(600,000,000)
Cash dividends	(591,000,000)	(571,000,000)	(542,000,000)
Purchases of treasury stock	(425,000,000)	(595,000,000)	(312,000,000)
Proceeds from the exercise of stock options	101,000,000	39,000,000	89,000,000
Other financing activities	(10,000,000)	(50,000,000)	(35,000,000)
Cash used for financing activities	(1,335,000,000)	(503,000,000)	(1,676,000,000)
Effect of exchange rate changes on cash	4,000,000	12,000,000	20,000,000
(Decrease) increase in cash, cash equivalents, and restricted cash	(3,000,000)	(609,000,000)	572,000,000
Cash, cash equivalents, and restricted cash at beginning of year	471,000,000	1,080,000,000	508,000,000
Cash, cash equivalents, and restricted cash at end of year	468,000,000	471,000,000	1,080,000,000
Components of cash, cash equivalents, and restricted cash
Cash and cash equivalents	468,000,000	471,000,000	1,072,000,000
Restricted cash, current (Other current assets)	0	0	8,000,000
Total cash, cash equivalents, and restricted cash	468,000,000	$ 471,000,000	$ 1,080,000,000
Change in Accounting Method Accounted for as Change in Estimate
Operating activities:
Net income	$ (103,000,000)