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Debt - Schedule of Long-term Debt (Details) € in Millions | Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Nov. 30, 2023 USD ($) | Nov. 29, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jan. 27, 2023 USD ($) | Sep. 30, 2022
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 4,048,000,000 |  |  |  | $ 4,002,000,000 |  |
Issuance premium less unamortized discount and unamortized deferred financing costs | (34,000,000) |  |  |  | (38,000,000) |  |
Total long-term debt, including the current portion, net | $ 4,014,000,000 |  |  |  | $ 3,964,000,000 |  |
3.750% Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) | 3.75% | 3.75% |  |  | 3.75% |  | 3.75%
Acquisition Corp. | Senior Term Loan Facility due 2031 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 1,295,000,000 |  |  |  | $ 1,295,000,000 |  |
Acquisition Corp. | 2.750% Senior Secured Notes due 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) | 2.75% | 2.75% |  |  |  |  |
Face or principal amount of debt instrument | € |  | € 325 |  |  |  |  |
Total long-term debt, including the current portion | $ 363,000,000 |  |  |  | 343,000,000 |  |
Acquisition Corp. | 3.750% Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) | 3.75% | 3.75% |  |  |  |  |
Total long-term debt, including the current portion | $ 540,000,000 |  |  |  | 540,000,000 |  |
Acquisition Corp. | 3.875% Senior Secured Notes due 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) | 3.875% | 3.875% |  |  |  |  |
Total long-term debt, including the current portion | $ 535,000,000 |  |  |  | 535,000,000 |  |
Acquisition Corp. | 2.250% Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) | 2.25% | 2.25% |  |  |  |  |
Face or principal amount of debt instrument | € |  | € 445 |  |  |  |  |
Total long-term debt, including the current portion | $ 497,000,000 |  |  |  | 471,000,000 |  |
Acquisition Corp. | 3.000% Senior Secured Notes due 2031 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) | 3.00% | 3.00% |  |  |  |  |
Total long-term debt, including the current portion | $ 800,000,000 |  |  |  | 800,000,000 |  |
Acquisition Corp. | Term Loan Mortgage |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face or principal amount of debt instrument |  |  |  |  |  | $ 19,000,000 |
Total long-term debt, including the current portion | 18,000,000 |  |  |  | 18,000,000 |  |
Acquisition Corp. | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | 0 |  |  |  | 0 |  |
Line of credit facility, current borrowing capacity | 350,000,000 |  | $ 350,000,000 | $ 300,000,000 | 350,000,000 |  |
Letters of credit outstanding | 0 |  |  |  | 2,000,000 |  |
Revolving credit facility outstanding | $ 0 |  |  |  | $ 0 |  |

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