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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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