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Debt - Tender Offer and Redemption of 5.000% Senior Secured Notes (Details)			12 Months Ended
	Aug. 01, 2020 USD ($)	Jul. 14, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2020 EUR (€)	Jun. 30, 2020 USD ($)	Jun. 29, 2020 USD ($)	Jun. 29, 2020 EUR (€)	Jun. 16, 2020
Debt Instrument [Line Items]
Redemptions of senior notes			$ 0	$ 0	$ 635,000,000
Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument			3,127,000,000	2,998,000,000
Unamortized deferred financing costs			$ 29,000,000	$ 29,000,000
5.000% Senior Secured Notes due 2023 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate		5.00%	5.00%			5.00%	5.00%	5.00%	5.00%	5.00%
Face or principal amount of debt instrument		$ 244,000,000					$ 244,000,000	$ 244,000,000
Debt instrument remaining outstanding amount							$ 300,000,000
Redemptions of senior notes		$ 295,000,000
Redemption price, percentage of principal amount redeemed	101.25%
Unamortized deferred financing costs	$ 6,000,000
3.875% Senior Secured Notes due 2030 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			3.875%			3.875%	3.875%	3.875%	3.875%
Face or principal amount of debt instrument			$ 535,000,000					$ 535,000,000
Unamortized deferred financing costs			$ 6,000,000
2.750% Senior Secured Notes due 2028 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			2.75%			2.75%	2.75%	2.75%	2.75%
Face or principal amount of debt instrument			$ 379,000,000			€ 325,000,000			€ 325,000,000
Unamortized deferred financing costs			$ 4,000,000

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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