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Debt - Extinguishments of Debt (Details) € in Millions, £ in Millions, $ in Millions | Sep. 30, 2025 EUR (€) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 GBP (£) | Sep. 30, 2024 USD ($)
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0.034% Notes due August 13, 2025 |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Interest rate (percent) | 0.034% | 0.034% | 0.034% |
0.034% Notes due August 13, 2025 | Euro Member Countries, Euro |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Debt instrument, repurchased face amount | € | € 500 |  |  |
0.034% Notes due August 13, 2025 | United States of America, Dollars |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Debt instrument, repurchased face amount |  | $ 584 |  |
3.020% Notes due May 24, 2025 |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Interest rate (percent) | 3.02% | 3.02% | 3.02% |
3.020% Notes due May 24, 2025 | United States of America, Dollars |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Debt instrument, repurchased face amount |  | $ 339 |  |
3.020% Notes due May 24, 2025 | United Kingdom, Pounds |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Debt instrument, repurchased face amount | £ |  |  | £ 250 |
3.734% Notes due December 15, 2024 |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Debt instrument, repurchased face amount |  | $ 875 |  |
Interest rate (percent) | 3.734% | 3.734% | 3.734% |
3.363% Notes due June 6, 2024 |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Debt instrument, repurchased face amount |  |  |  | $ 998
Interest rate (percent) |  |  |  | 3.363%
3.875% Notes due May 15, 2024 |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Debt instrument, repurchased face amount |  |  |  | $ 144
Interest rate (percent) |  |  |  | 3.875%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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