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Debt - Redemption of 4.125% Senior Secured Notes and 4.875% Senior Secured Notes (Details)				12 Months Ended
	Jun. 30, 2020 USD ($)	Oct. 12, 2018 USD ($)	Oct. 09, 2018 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2020 EUR (€)	Jun. 30, 2020 EUR (€)	Jun. 29, 2020 USD ($)	Jun. 29, 2020 EUR (€)	Oct. 12, 2018 EUR (€)
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt				$ (34,000,000)	$ (7,000,000)	$ (31,000,000)
Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument				$ 3,127,000,000	$ 2,998,000,000
4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate				4.125%	4.125%	4.125%	4.125%
4.125% Senior Secured Notes due 2024 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	4.125%		4.125%	4.125%			4.125%	4.125%	4.125%	4.125%	4.125%
Face or principal amount of debt instrument | €								€ 311,000,000		€ 311,000,000
Debt instrument remaining outstanding amount | €								€ 322,000,000			€ 311,000,000
Redemption price, percentage of principal amount redeemed	103.094%	103.00%
Gain (loss) on extinguishment of debt	$ (14,000,000)	$ (2,000,000)
4.875% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate				4.875%	4.875%	4.875%	4.875%
4.875% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	4.875%		4.875%	4.875%			4.875%	4.875%	4.875%	4.875%
Face or principal amount of debt instrument	$ 220,000,000		$ 30,000,000						$ 220,000,000
Debt instrument remaining outstanding amount	$ 230,000,000		220,000,000
Redemption price, percentage of principal amount redeemed	103.656%
Gain (loss) on extinguishment of debt	$ (10,000,000)		$ (1,000,000)	$ (24,000,000)
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%	3.875%
Face or principal amount of debt instrument				$ 535,000,000					$ 535,000,000
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%	2.75%
Face or principal amount of debt instrument				$ 379,000,000			€ 325,000,000			€ 325,000,000

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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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