DEBT

The major components of debt are as follows (in millions):



	March 31, 2018			September 30, 2017
Revolving credit facility	$	—		$	—
Commercial paper	1,000			778
Senior notes:
7.00% Notes due May 2018	120			120
Notes due May 2019 (2.43% at 3/31/2018)	300			300
2.65% Notes due August 2019	1,000			1,000
Notes due June 2020 (2.57% at 3/31/2018)	350			350
Notes due August 2020 (2.34% at 3/31/2018)	400			400
4.10% Notes due September 2020	282			282
2.25% Notes due August 2021	500			500
4.50% Senior notes due June 2022	1,000			1,000
3.95% Notes due August 2024	1,250			1,250
3.55% Notes due June 2027	1,350			1,350
7.00% Notes due January 2028	18			18
6.13% Notes due November 2032	162			162
4.88% Notes due August 2034	500			500
5.15% Notes due August 2044	500			500
4.55% Notes due June 2047	750			750
Discount on senior notes	(14		)	(15		)
Term loans:
Tranche B due August 2019	—			427
Tranche B due August 2020 (2.74% at 3/31/2018)	500			500
Other	77			81
Unamortized debt issuance costs	(45		)	(50		)
Total debt	10,000			10,203
Less current debt	1,128			906
Total long-term debt	$	8,872		$	9,297

Revolving Credit Facility

In March 2018, we amended our existing credit facility which, among other things, increased our line of credit from $1.5 billion to $1.75 billion. This facility supports short-term funding needs and letters of credit and will mature and the commitments thereunder will terminate in March 2023. Amounts available for borrowing under this facility totaled $1.75 billion at March 31, 2018, net of outstanding letters of credit and outstanding borrowings. At March 31, 2018, we had no outstanding letters of credit issued under this facility. At March 31, 2018, we had an additional $106 million of bilateral letters of credit issued separately from the revolving credit facility, none of which were drawn upon. Our letters of credit are issued primarily in support of leasing and workers’ compensation insurance programs and other legal obligations.

If in the future any of our subsidiaries shall guarantee any of our material indebtedness, such subsidiary shall be required to guarantee the indebtedness, obligations and liabilities under this facility.

Commercial Paper Program

We have a commercial paper program under which we may issue unsecured short-term promissory notes ("commercial paper") up to an aggregate maximum principal amount of $1 billion as of March 31, 2018. As of March 31, 2018, we had $1 billion of commercial paper outstanding at a weighted average interest rate of 2.28% with maturities of less than 105 days.

Term Loan Tranche B due August 2019

During the first quarter of fiscal 2018, we extinguished the $427 million outstanding balance of the Term Loan Tranche B due in August 2019 using cash on hand and proceeds received from the sale of a non-protein business.

Debt Covenants

Our revolving credit and term loan facilities contain affirmative and negative covenants that, among other things, may limit or restrict our ability to: create liens and encumbrances; incur debt; merge, dissolve, liquidate or consolidate; make acquisitions and investments; dispose of or transfer assets; change the nature of our business; engage in certain transactions with affiliates; and enter into hedging transactions, in each case, subject to certain qualifications and exceptions. In addition, we are required to maintain minimum interest expense coverage and maximum debt-to-capitalization ratios.

Our senior notes also contain affirmative and negative covenants that, among other things, may limit or restrict our ability to: create liens; engage in certain sale/leaseback transactions; and engage in certain consolidations, mergers and sales of assets.

We were in compliance with all debt covenants at March 31, 2018.