comcast corporation 2015 debt redemptions and repayments year ended december 31 , 2015 ( in millions ) .
what was the percent of the net of amounts out- standing under our commercial paper programs and outstanding letters of credit associated with the nbcuniversal enterprise revolving credit facility
( a ) the early redemption of these senior notes resulted in $ 47 million of additional interest expense in 2015 . debt instruments revolving credit facilities as of december 31 , 2015 , comcast and comcast cable communications , llc had a $ 6.25 billion revolving credit facility due june 2017 with a syndicate of banks ( 201ccomcast revolving credit facility 201d ) . the interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on our credit rating . as of december 31 , 2015 , the borrowing margin for london interbank offered rate ( 201clibor 201d ) based borrow- ings was 1.00% ( 1.00 % ) . this revolving credit facility requires that we maintain certain financial ratios based on our debt and our operating income before depreciation and amortization , as defined in the credit facility . we were in compliance with all financial covenants for all periods presented . as of december 31 , 2015 , nbcuniversal enterprise had a $ 1.35 billion revolving credit facility due march 2018 with a syndicate of banks ( 201cnbcuniversal enterprise revolving credit facility 201d ) . the interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on our credit rating . as of december 31 , 2015 , the borrowing margin for libor-based borrowings was 1.00% ( 1.00 % ) . as of december 31 , 2015 , amounts available under our consolidated credit facilities , net of amounts out- standing under our commercial paper programs and outstanding letters of credit , totaled $ 6.4 billion , which included $ 775 million available under the nbcuniversal enterprise revolving credit facility . term loans as a result of the universal studios japan transaction , we consolidated a5400 billion of term loans having a final maturity of november 2020 . in accordance with acquisition accounting , these debt securities were recorded at fair value as of the acquisition date . these term loans contain financial and operating covenants and are secured by the assets of universal studios japan and the equity interests of the investors . we do not guarantee these term loans and they are otherwise nonrecourse to us . commercial paper programs our commercial paper programs provide a lower-cost source of borrowing to fund our short-term working capital requirements . the maximum borrowing capacity under the comcast commercial paper program is $ 6.25 billion and it is supported by the comcast revolving credit facility . the maximum borrowing capacity under the nbcuniversal enterprise commercial paper program is $ 1.35 billion and it is supported by the nbcuniversal enterprise revolving credit facility . letters of credit as of december 31 , 2015 , we and certain of our subsidiaries had unused irrevocable standby letters of credit totaling $ 464 million to cover potential fundings under various agreements . 99 comcast 2015 annual report on form 10-k .