Our short-term borrowings and current portion of long-term debt consists of the followings:



	December 31,
(Dollars in millions)	2016			2015
Revolving credit facility	—			967
Other short-term bank loans	2			214
Total short-term borrowings	2			1,181
Current portion of long-term debt	177			401
Short-term borrowings and current portion of long-term debt	$	179		$	1,582
Weighted average interest rate on short-term borrowings outstanding at end of year	0.7		%	2.7		%

Revolving Credit Facility and Secured Term Loan Agreement

We have a revolving credit facility (the “Revolving Credit Agreement”) in the amount of $1.38 billion and a $425 million secured term loan agreement (the “Term Loan Agreement” and collectively with the Revolving Credit Agreement, the “Credit Agreements”). For lenders that extended their commitments (“extending lenders”), the Revolving Credit Agreement matures in July of 2019. For lenders that did not extend their commitments (such lenders, representing $229 million, the “non-extending lenders”), the Revolving Credit Agreement matures in July of 2017. The Term Loan Agreement matures on July of 2020, and beginning September 30, 2016, a principal repayment of $12.5 million is required on the last day of each quarter. At December 31, 2016, we had $1.3 billion available for borrowing under our Revolving Credit Agreement and there were $63 million in outstanding letters of credit.

Loans under the Credit Agreements are subject to varying rates of interest based on whether the loan is a Eurodollar loan or an alternate base rate loan. We also incur a quarterly facility fee on the amount of the Revolving Credit Agreement. See “Note 13 – Long-term Debt”, for information related to interest rate applicable for the Term Loan Agreement.

Eurodollar Loans. Eurodollar loans bear interest at the Eurodollar rate, which is LIBOR, plus the applicable margin. The applicable margin for Eurodollar loans under the Revolving Credit Agreement depends on whether the lender is an extending lender or a non-extending lender. For non-extending lenders, the applicable margin under the Revolving Credit Agreement ranges from 0.75% to 1.925% depending on our credit rating, and for extending lenders under the Revolving Credit Agreement the applicable margin ranges from 1.925% to 3.7% depending on our leverage ratio.

Alternate Base Rate Loans. Alternate base rate loans bear interest at the alternate base rate plus the applicable margin. The applicable margin for alternate base rate loans under the Revolving Credit Agreement depends on whether the lender is an extending lender or a non-extending lender. For non-extending lenders, the applicable margin under the Revolving Credit Agreement ranges from 0% to 0.925% depending on our credit rating, and for extending lenders the applicable margin under the Revolving Credit Agreement ranges from 0.925% to 2.7% depending on our leverage ratio.

For the year ended December 31, 2016, the interest rate for the Revolving Credit Agreement was LIBOR plus a margin rate of 1.925%. See “Note 13 – Long-term Debt” for the interest rate details for the Term Loan Agreement. Borrowings under our Revolving Credit Agreement may be repaid from time to time without penalty. Obligations under the Term Loan Agreement are secured by substantially all of our assets. In addition, obligations under the Credit Agreements are guaranteed by a material portion of our subsidiaries.

Our Credit Agreements contain covenants including, among others, the following:


•	a prohibition against incurring debt, subject to permitted exceptions;


•	a restriction on creating liens on our assets and the assets of our operating subsidiaries, subject to permitted exceptions;


•	restrictions on mergers or asset dispositions;


•	restrictions on use of proceeds, investments, transactions with affiliates, or change of principal business; and


•	maintenance of the following financial covenants:


1)	Leverage ratio of no greater than 3.0 to 1 through December 31, 2016 and 2.5 to 1 thereafter until maturity. This ratio measures our indebtedness guaranteed by subsidiaries under the Credit Agreements and other guaranteed facilities to the trailing four quarters consolidated adjusted earnings before interest, taxes, depreciation, amortization and other specified charges (“EBITDA”);


2)	Leverage and letters of credit ratio of no greater than 4.0 to 1 on or before December 31, 2016 and 3.5 to 1 thereafter calculated as our indebtedness guaranteed by subsidiaries under the Credit Agreements and other guaranteed facilities and all letters of credit to the trailing four quarters consolidated adjusted EBITDA; and


3)	Asset coverage ratio of at least 4.0 to 1, which is calculated as our asset value to indebtedness guaranteed by subsidiaries under the Credit Agreements and other guaranteed facilities.

Our Credit Agreements contain customary events of default, including our failure to comply with the financial covenants described above. As of December 31, 2016, we were in compliance with these financial covenants.

On July 19, 2016, we amended these facilities to make minor changes and amendments to certain collateral provisions, negative covenants and related definitions, and to add an accordion feature to permit new and existing lenders to add up to a maximum of $250 million in additional commitments.

Other Short-Term Borrowings and Other Debt Activity

We have short-term borrowings with various domestic and international institutions pursuant to uncommitted credit facilities. At December 31, 2016, we had $2 million in short-term borrowings under these arrangements. In 2016, we repaid $180 million, with a LIBOR-based weighted average interest rate of 1.95%, borrowed under a credit agreement that matured in the first half of 2016. In addition, we had $450 million of letters of credit under various uncommitted facilities and $54 million of surety bonds, primarily performance bonds, issued by financial sureties against an indemnification from us at December 31, 2016.

At December 31, 2016, the current portion of long-term debt was primarily related to our 6.35% Senior Notes due 2017 and the current portion of our secured term loan and capital leases. Our 5.50% senior notes with a principal balance of $350 million were repaid in February 2016.

364-Day Term Loan Facility

On April 9, 2015, we repaid the $175 million balance of our $400 million, 364-day term loan facility with a syndicate of banks. Previously in 2014, proceeds from this 364-day term loan facility were used to refinance our prior 364-day term loan facility and had substantially similar terms and conditions to our prior 364-day term loan facility.