A summary of long-term debt at September 30, 2023 and December 31, 2022, including related interest rates at September 30, 2023, follows (dollars in millions):


	September 30, 2023			December 31, 2022
Senior secured asset-based revolving credit facility (effective interest rate of 6.7%)	$	1,480		$	2,900
Senior secured revolving credit facility		—			—
Senior secured term loan facilities (effective interest rate of 6.8%)		1,331			1,880
Other senior secured debt (effective interest rate of 4.0%)		974			953
Senior secured debt		3,785			5,733
Senior unsecured notes (effective interest rate of 5.0%)		35,902			32,652
Debt issuance costs and discounts		(341	)		(301	)
Total debt (average life of 9.6 years, rates averaging 5.1%)		39,346			38,084
Less amounts due within one year		2,553			370
	$	36,793		$	37,714

During January 2023, the availability under our senior secured revolving credit facility was increased by $1.500 billion to total $3.500 billion, the senior secured term loan B facility was fully retired and certain administrative updates were made to our credit agreements.

During May 2023, we issued $3.250 billion aggregate principal amount of senior notes comprised of (i) $1.000 billion aggregate principal amount of 5.200% senior notes due 2028, (ii) $1.250 billion aggregate principal amount of 5.500% senior notes due 2033 and (iii) $1.000 billion aggregate principal amount of 5.900% senior notes due 2053. We used the net proceeds to repay borrowings under our asset-based revolving credit facility.