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Debt - Long-term Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 16, 2020	Sep. 30, 2019	Jun. 30, 2019	Apr. 30, 2019	Oct. 12, 2018	Oct. 09, 2018
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 3,000		$ 2,974
4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate	4.125%			4.125%
4.875% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate	4.875%			4.875%
3.625% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Interest rate	3.625%			3.625%
Acquisition Corp. | Senior Term Loan Facility due 2023
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 1,315		1,313
Acquisition Corp. | 5.000% Senior Secured Notes due 2023
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 298		298
Interest rate	5.00%	5.00%
Acquisition Corp. | 4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 346		336
Interest rate	4.125%					4.125%	4.125%
Acquisition Corp. | 4.875% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 218		218
Interest rate	4.875%						4.875%
Acquisition Corp. | 3.625% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 501		488
Interest rate	3.625%				3.625%		3.625%
Acquisition Corp. | 5.500% Senior Notes due 2026
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 322		321
Interest rate	5.50%
Acquisition Corp. | Revolving Credit Facility
Debt Instrument [Line Items]
Total long-term debt, including the current portion	$ 0		$ 0

X

- Definition

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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