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Share-based Compensation - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 USD ($) $ / shares
Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period of options issued under EIP (in years) | 10 years |  |
Total intrinsic value from options exercised | $ 185 | $ 134 | $ 56
Tax benefit from exercise of stock options | 28 | $ 28 | $ 11
Unrecognized compensation cost | $ 27 |  |
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years) | 5 months 1 day |  |
Vesting period from the date of grant (in years) | 3 years |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 796 |  |
Vesting period from the date of grant (in years) | 3 years |  |
Number of shares of common stock issued for each award | 1 |  |
Weighted average grant date fair value (in dollars per share) | $ / shares | $ 253.29 | $ 212.94 | $ 204.73
Total grant date fair value of shares vested and earned | $ 616 | $ 486 | $ 380
Weighted-average period (in years) | 11 months 4 days |  |
Performance-based Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 75 |  |
Vesting period from the date of grant (in years) | 3 years |  |
Weighted average grant date fair value (in dollars per share) | $ / shares | $ 281.85 |  |
Total grant date fair value of shares vested and earned | $ 81 | 44 | 49
Weighted-average period (in years) | 10 months 17 days |  |
2007 Equity Incentive Compensation Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of Class A Common Stock authorized for issuance under EIP or ESPP (in shares) | shares | 198 |  |
Share-based compensation expense under EIP | $ 817 | 734 | 571
Tax benefit under EIP | $ 128 | $ 112 | $ 82

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