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Debt - Tender Offer and Notes Redemption (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Mar. 14, 2018
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ (34,000,000)	$ (7,000,000)	$ (31,000,000)
Senior Notes
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt				$ (23,000,000)
Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 3,127,000,000	$ 2,998,000,000
6.750% Senior Notes
Debt Instrument [Line Items]
Interest rate		6.75%	6.75%	6.75%	6.75%
Face or principal amount of debt instrument					$ 523,000,000
Gain (loss) on extinguishment of debt	$ (5,000,000)
6.750% Senior Notes | Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument					112,000,000
Redemption deposit					$ 119,000,000

X

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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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