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Debt - Narrative (Details) € in Millions, $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 16, 2021 USD ($) | Apr. 15, 2021 USD ($) | Mar. 08, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2022 EUR (€) | Nov. 24, 2021 EUR (€) | Aug. 16, 2021 EUR (€) | Apr. 14, 2021 USD ($) | Jan. 20, 2021 USD ($) | Nov. 02, 2020 USD ($) | Aug. 12, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ 10 | $ 12 |  | $ 0 | $ 22 | $ 34 |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, total indebtedness to EBITDA ratio |  |  |  |  |  |  | 3.50 |  |  |  |  |  |
2.750% Senior Secured Notes due 2028 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 2.75% |  |  |  | 2.75% |  |
Face or principal amount of debt instrument | € |  |  |  |  |  |  | € 325 |  |  |  |  |  |
3.750% Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 3.75% | 3.75% | 3.75% |  |  |  |  |  |
3.750% Senior Secured Notes | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.75% | 3.75% |  |  |  |  |
Face or principal amount of debt instrument | € |  |  |  |  |  |  |  | € 540 |  |  |  |  |
3.875% Senior Secured Notes due 2030 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.875% |  |  |  | 3.875% |  |
2.250% Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 2.25% | 2.25% | 2.25% |  |  |  |  |  |
2.250% Senior Secured Notes | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 2.25% |  | 2.25% |  | 2.25% |  |
Face or principal amount of debt instrument | € |  |  |  |  |  |  | € 445 |  | € 445 |  |  |  |
3.000% Senior Secured Notes due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 3.00% | 3.00% | 3.00% |  |  |  |  |  |
3.000% Senior Secured Notes due 2031 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.00% |  |  |  | 3.00% | 3.00% | 3.00%
Face or principal amount of debt instrument |  |  |  |  |  |  |  |  |  |  |  | $ 250 |
Senior Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, fee amount |  |  |  |  |  |  |  |  |  |  | $ 3 |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 1 |  |
Senior Term Loan Facility | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face or principal amount of debt instrument |  | $ 1,145 |  |  |  |  |  |  |  | $ 325 |  |  |
Line of credit facility, increase (decrease), net |  |  | $ 325 |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 1,145 |  |  |  |  |  |  |  |  |  |
5.500% Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 5.50% | 5.50% | 5.50% |  |  |  |  |  |
5.500% Senior Notes due 2026 | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.50% | 5.50% |  |  |  | 5.50% |  |  |  |  |  |
Debt instrument remaining outstanding amount |  | $ 343 |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 102.75% |  |  |  |  |  |  |  |  |  |  |
3.625% Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 3.625% | 3.625% | 3.625% |  |  |  |  |  |
3.625% Senior Secured Notes | Acquisition Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.625% |  | 3.625% |  |  |  |
Debt instrument remaining outstanding amount | € |  |  |  |  |  |  |  |  | € 463 |  |  |  |
Redemption price, percentage of principal amount redeemed | 102.28% |  |  |  |  |  |  |  |  |  |  |  |

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