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Debt - Debt Capitalization (Narrative) (Details) $ in Millions | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Nov. 30, 2023
--- | --- | --- | ---
Revolving Credit Facility | Line of Credit |  |  |
Short-Term Debt [Line Items] |  |  |
Debt instrument, covenant, total indebtedness to EBITDA ratio | 3.50 |  |
Acquisition Corp. |  |  |
Short-Term Debt [Line Items] |  |  |
Total debt, including the current portion | $ 4,090 | $ 4,048 |
Acquisition Corp. | Revolving Credit Facility |  |  |
Short-Term Debt [Line Items] |  |  |
Total debt, including the current portion | 0 | 0 |
Debt instrument, covenant, total indebtedness to EBITDA ratio |  |  | 3.60
Senior Term Loan Credit Agreement | Acquisition Corp. |  |  |
Short-Term Debt [Line Items] |  |  |
Total debt, including the current portion | 1,295 |  |
2.750% Senior Secured Notes due 2028 | Acquisition Corp. |  |  |
Short-Term Debt [Line Items] |  |  |
Total debt, including the current portion | $ 381 | 363 |
Interest rate (as a percent) | 2.75% |  |
3.750% Senior Secured Notes | Acquisition Corp. |  |  |
Short-Term Debt [Line Items] |  |  |
Total debt, including the current portion | $ 540 | 540 |
Interest rate (as a percent) | 3.75% |  |
3.875% Senior Secured Notes due 2030 | Acquisition Corp. |  |  |
Short-Term Debt [Line Items] |  |  |
Interest rate (as a percent) | 3.875% |  |
2.250% Senior Secured Notes due 2031 | Acquisition Corp. |  |  |
Short-Term Debt [Line Items] |  |  |
Total debt, including the current portion | $ 522 | 497 |
Interest rate (as a percent) | 2.25% |  |
3.000% Senior Secured Notes due 2031 | Acquisition Corp. |  |  |
Short-Term Debt [Line Items] |  |  |
Total debt, including the current portion | $ 800 | $ 800 |
Interest rate (as a percent) | 3.00% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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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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