Financing Arrangements (Tables)

6 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The following table reflects principal amounts of debt and debt net of discounts and issuance costs for the periods presented:

	March 31, 2020				September 30, 2019
(In millions)	Principal amount		Net of discounts and issuance costs		Principal amount		Net of discounts and issuance costs
Term Loan Credit Agreement due December 15, 2024	$	2,624	$	2,601	$	2,874	$	2,846
Convertible 2.25% senior notes due June 15, 2023	350		282		350		273
Total debt	$	2,974	2,883		$	3,224	3,119
Debt maturing within one year			—				(29)
Long-term debt, net of current portion			$	2,883			$	3,090

Convertible Debt

The net carrying amount of the Convertible Notes for the periods indicated was as follows:

(In millions)	March 31, 2020		September 30, 2019
Principal	350		$	350
Less:
Unamortized debt discount	(63)		(72)
Unamortized issuance costs	(5)		(5)
Net carrying amount	$	282	$	273