Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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The average effective interest rate during the reporting period.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Debt - Narrative (Details)			1 Months Ended		6 Months Ended	12 Months Ended
Debt - Narrative (Details)	Apr. 12, 2019 USD ($)	Nov. 29, 2016 USD ($)	Aug. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)	Apr. 11, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds from borrowings, net of issuance costs						$ 750,000,000	$ 304,000,000	$ 470,000,000
Outstanding principal balance						1,351,000,000
Repayments on borrowings						734,000,000	108,000,000	$ 90,000,000
Quarterly installments due in fiscal 2020						15,000,000
Quarterly installments due in fiscal 2021						43,000,000
Line of Credit \| Revolver
Debt Instrument [Line Items]
Amount outstanding						0	147,000,000
2025 Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate of debt			4.375%
Aggregate principal amount			$ 400,000,000
Proceeds from borrowings, net of issuance costs			394,000,000
Outstanding principal balance						400,000,000	400,000,000
2024 Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate of debt				5.50%
Aggregate principal amount			$ 375,000,000	$ 375,000,000
Proceeds from borrowings, net of issuance costs				$ 370,000,000
Outstanding principal balance						$ 375,000,000	375,000,000
2016 Credit Facilities
Debt Instrument [Line Items]
Principal amount of line of credit									$ 1,325,000,000
2016 Term Loans \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Principal amount of line of credit									$ 875,000,000
Term of debt									5 years
Outstanding principal balance							270,000,000
Repayments on borrowings	$ 255,000,000				$ 15,000,000
2016 Revolver \| Line of Credit \| Revolver
Debt Instrument [Line Items]
Principal amount of line of credit									$ 450,000,000
Term of debt									5 years
Line of credit, sublimit									$ 100,000,000
Borrowings from of line of credit facilities					$ 39,000,000
Repayments of line of credit facilities	186,000,000
2019 Credit Facilities
Debt Instrument [Line Items]
Principal amount of line of credit	1,050,000,000
2019 Credit Facilities \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						1.375%
2019 Credit Facilities \| Minimum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						0.375%
2019 Credit Facilities \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						2.00%
2019 Credit Facilities \| Maximum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						1.00%
2019 Credit Facilities \| Line of Credit
Debt Instrument [Line Items]
Maximum consolidated leverage ratio						4.5
Minimum consolidated interest coverage ratio						3.0
2019 Term Loans \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Principal amount of line of credit	$ 575,000,000
Term of debt	5 years
Quarterly installments due in fiscal 2020						$ 7,000,000
Quarterly installments due in fiscal 2021						14,000,000
2019 Revolver
Debt Instrument [Line Items]
Letters of credit outstanding						9,000,000
2019 Revolver \| Line of Credit \| Revolver
Debt Instrument [Line Items]
Principal amount of line of credit	$ 475,000,000
Term of debt	5 years
Line of credit, sublimit	$ 100,000,000
Amount outstanding						0
Borrowings from of line of credit facilities						6,000,000
Remaining borrowing capacity						466,000,000
Repayments of line of credit facilities						6,000,000
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Proceeds from borrowings, net of issuance costs						84,000,000
Principal amount of line of credit		$ 125,000,000				175,000,000
Term of debt		1 year
Amount outstanding						0	$ 140,000,000
Repayments of line of credit facilities	$ 120,000,000					224,000,000
Remaining borrowing capacity						$ 168,000,000
Weighted-average interest rate						3.40%	2.80%
Trade Receivables Facility \| Line of Credit \| Secured Debt \| Financing Subsidiary
Debt Instrument [Line Items]
Accounts receivable pledged as collateral						$ 259,000,000	$ 275,000,000