SENIOR NOTES PAYABLE

6 Months Ended

Mar. 31, 2020

SENIOR NOTES PAYABLE

The following table summarizes our senior notes payable.



$ in millions	March 31, 2020			September 30, 2019
5.625% senior notes, due 2024	$	250		$	250
3.625% senior notes, due 2026	500			500
4.65% senior notes, due 2030	500			—
4.95% senior notes, due 2046	800			800
Total principal amount	2,050			1,550
Unaccreted premium/(discount)	10			11
Unamortized debt issuance costs	(16		)	(11		)
Total senior notes payable	$	2,044		$	1,550

In March 2012, we sold in a registered underwritten public offering $250 million in aggregate principal amount of 5.625% senior notes due April 2024. Interest on these senior notes is payable semi-annually. We may redeem some or all of these senior notes at any time prior to their maturity, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes redeemed, or (ii) the sum of the present values of the remaining scheduled payments of principal and interest thereon, discounted to the redemption date at a discount rate equal to a designated U.S. Treasury rate, plus 50 basis points, plus accrued and unpaid interest thereon to the redemption date.

In July 2016, we sold in a registered underwritten public offering $500 million in aggregate principal amount of 3.625% senior notes due September 2026. Interest on these senior notes is payable semi-annually. We may redeem some or all of these senior notes at any time prior to their maturity, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes redeemed, or (ii) the sum of the present values of the remaining scheduled payments of principal and interest thereon, discounted to the redemption date at a discount rate equal to a designated U.S. Treasury rate, plus 35 basis points, plus accrued and unpaid interest thereon to the redemption date.

In March 2020, we sold in a registered underwritten public offering $500 million in aggregate principal amount of 4.65% senior notes due April 2030. Interest on these senior notes is payable semi-annually. We may redeem some or all of these senior notes at any time prior to January 1, 2030, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes redeemed, or (ii) the sum of the present values of the remaining scheduled payments of principal and interest thereon, discounted to the redemption date at a discount rate equal to a designated U.S. Treasury rate, plus 50 basis points; and on or after January 1, 2030, at 100% of the principal amount of the notes redeemed; plus, in each case, accrued and unpaid interest thereon to the redemption date.

In July 2016, we sold in a registered underwritten public offering $300 million in aggregate principal amount of 4.95% senior notes due July 2046. In May 2017, we reopened the offering and sold, in a registered underwritten public offering, an additional $500 million in aggregate principal amount of 4.95% senior notes due July 2046. These additional senior notes were consolidated, formed into a single series, and are fully fungible with the $300 million in aggregate principal amount 4.95% senior notes issued in July 2016. Interest on these senior notes is payable semi-annually. We may redeem some or all of these senior notes at any time prior to their maturity, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes redeemed, or (ii) the sum of the present values of the remaining scheduled payments of principal and interest thereon, discounted to the redemption date at a discount rate equal to a designated U.S. Treasury rate, plus 45 basis points, plus accrued and unpaid interest thereon to the redemption date.