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STOCK-BASED COMPENSATION - Narratives (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Oct. 03, 2019	Oct. 02, 2014	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense	$ 152,000,000	$ 188,000,000	$ 135,000,000
Stock option weighted-average grant date fair value	$ 549.03	$ 397.31	$ 251.73
Unrecognized compensation cost related to non-vested awards expected to vest	$ 208,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Fair value of options vested	$ 107,000,000	$ 97,000,000	$ 80,000,000
Dividend equivalent payments, current (Note 16)	59,000,000	180,000,000
Dividend Equivalent Payments on Certain Stock Options, Non-current	76,000,000
Share-Based Payment Arrangement, Tax Benefit	24,000,000	24,000,000	15,000,000
Share-Based Payment Arrangement, Noncurrent Liabilities, Other	102,000,000
Dividend Equivalent Payments	208,000,000	233,000,000	38,000,000
Payments of special dividends	5,073,000,000
Cash dividend equivalent payments	159,000,000
Other Non-Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense	2,000,000	54,000,000	23,000,000
Additional Paid-In Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense	$ 150,000,000	134,000,000	112,000,000
2019 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock				4,000,000
Shares available for award	3,210,451
2014 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock					5,000,000
2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock						8,119,668
2003 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 600,000,000	$ 794,000,000	$ 500,000,000
S 2025 Dividends
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared (in dollars per share)	$ 90.00
Performance Vested Stock Options | 2019 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award	346,664
Stock-based compensation activity (in shares)	26,420
Weighted-Average Exercise Price Per Option, Exercised	$ 656.47
Number of Options Exercisable at end of period	93,696
Weighted-Average Exercise Price Per Option, Exercisable	$ 724.47
Weighted-Average Remaining Contractual Term, Exercisable, years	7 years 7 months 6 days
Aggregate Intrinsic Value, Exercisable	$ 55,613,261
Performance Vested Stock Options | 2014 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award	0
Stock-based compensation activity (in shares)	462,368
Weighted-Average Exercise Price Per Option, Exercised	$ 288.80
Number of Options Exercisable at end of period	2,429,832
Weighted-Average Exercise Price Per Option, Exercisable	$ 376.64
Weighted-Average Remaining Contractual Term, Exercisable, years	3 years 7 months 6 days
Aggregate Intrinsic Value, Exercisable	$ 2,287,395,248

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

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- Details

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- Details

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