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

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Debt - Senior Notes (Details) - USD ($)		6 Months Ended
Debt - Senior Notes (Details) - USD ($)	Feb. 25, 2020	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019	Aug. 31, 2017	Jul. 31, 2016
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 19,000,000	$ 19,000,000	$ 0
Payment for Debt Extinguishment or Debt Prepayment Cost		15,000,000	0
Proceeds from borrowings, net of issuance costs	592,000,000	1,132,000,000	162,000,000
Repayments of Senior Debt	394,000,000
Repayments on borrowings		475,000,000	$ 137,000,000
Senior Notes \| 2024 Notes
Debt Instrument [Line Items]
Interest rate on senior unsecured notes						5.50%
Payment for Debt Extinguishment or Debt Prepayment Cost		15,000,000
Debt gross	$ (375,000,000)	0		$ 375,000,000
Senior Notes \| 2025 Notes
Debt Instrument [Line Items]
Interest rate on senior unsecured notes					4.375%
Aggregate principal amount					$ 400,000,000
Debt gross		400,000,000		400,000,000
Senior Notes \| Senior Unsecured Notes Due 2030 [Domain]
Debt Instrument [Line Items]
Interest rate on senior unsecured notes	4.25%
Aggregate principal amount	$ 600,000,000			$ 0
Line of Credit \| 2019 Term Loans
Debt Instrument [Line Items]
Repayments on borrowings		$ 100,000,000