Debt - Trade Receivables Facility (Details) - USD ($)	9 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Debt Instrument [Line Items]
Proceeds from borrowings	$ 743,000,000	$ 170,000,000
Repayments of long-term debt	727,000,000	$ 39,000,000
Line of Credit \| Trade Receivables Facility \| Secured Debt
Debt Instrument [Line Items]
Original principal amount of debt	175,000,000
Long-term debt outstanding amount	0		$ 140,000,000
Proceeds from borrowings	82,000,000
Repayments of long-term debt	222,000,000
Line of Credit \| Trade Receivables Facility \| Secured Debt \| Financing Subsidiary
Debt Instrument [Line Items]
Accounts receivable pledged as collateral	$ 274,000,000		$ 275,000,000

Amount of assets pledged to secure a debt instrument.

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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, 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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