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v3.23.3

Long-Term Debt - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Long-term debt, maturing in 2025 | $ 520,000,000 |  |  |
Long-term debt, maturing in 2026 | 538,000,000 |  |  |
Long-term debt, maturing in 2027 | 746,000,000 |  |  |
Long-term debt, maturing in 2028 | 497,000,000 |  |  |
Interest paid on long-term debt | 200,000,000 | $ 199,000,000 | $ 156,000,000 |
Repayments of long-term debt | 741,000,000 | 522,000,000 | $ 308,000,000 |
2.625% notes due February 2023 | Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt | $ 500,000,000 | $ 500,000,000 |  |
Notes interest rate, percentage | 2.625% | 2.625% |  |
2.625% notes due February 2023 | Notes Payable | AspenTech |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt | $ 264,000,000 |  |  |
2.0% notes due December 2028 | Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes interest rate, percentage | 2.00% |  |  | 2.00%
Debt, face amount |  |  |  | $ 1,000,000,000
2.20% notes due December 2031 | Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes interest rate, percentage | 2.20% |  |  | 2.20%
Debt, face amount |  |  |  | $ 1,000,000,000
2.80% notes due December 2051 | Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes interest rate, percentage | 2.80% |  |  | 2.80%
Debt, face amount |  |  |  | $ 1,000,000,000

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