as of december 31 , 2013 and 2012 , our liabilities associated with unrecognized tax benefits are not material . we and our subsidiaries file income tax returns in the u.s . federal jurisdiction and various foreign jurisdictions . with few exceptions , the statute of limitations is no longer open for u.s . federal or non-u.s . income tax examinations for the years before 2010 , other than with respect to refunds . u.s . income taxes and foreign withholding taxes have not been provided on earnings of $ 222 million , $ 211 million , and $ 193 million that have not been distributed by our non-u.s . companies as of december 31 , 2013 , 2012 , and 2011 . our intention is to permanently reinvest these earnings , thereby indefinitely postponing their remittance to the u.s . if these earnings were remitted , we estimate that the additional income taxes after foreign tax credits would have been approximately $ 50 million in 2013 , $ 45 million in 2012 , and $ 41 million in 2011 . our federal and foreign income tax payments , net of refunds received , were $ 787 million in 2013 , $ 890 million in 2012 , and $ 722 million in 2011 . our 2013 net payments reflect a $ 550 million refund from the irs primarily attributable to our tax-deductible discretionary pension contributions during the fourth quarter of 2012 ; our 2012 net payments reflect a $ 153 million refund from the irs related to a 2011 capital loss carryback claim ; and our 2011 net payments reflect a $ 250 million refund from the irs related to estimated taxes paid for 2010 . as of december 31 , 2013 and 2012 , we had federal and foreign taxes receivable of $ 313 million and $ 662 million recorded within other current assets on our balance sheet , primarily attributable to our tax-deductible discretionary pension contributions in the fourth quarter of 2013 and 2012 and our debt exchange transaction in the fourth quarter of 2012 . note 9 2013 debt our long-term debt consisted of the following ( in millions ) : .
what was the percent of the change in the total long-term debt net of unamortized discounts from 2012 to 2013
in december 2012 , we issued notes totaling $ 1.3 billion with a fixed interest rate of 4.07% ( 4.07 % ) maturing in december 2042 ( the new notes ) in exchange for outstanding notes totaling $ 1.2 billion with interest rates ranging from 5.50% ( 5.50 % ) to 8.50% ( 8.50 % ) maturing in 2023 to 2040 ( the old notes ) . in connection with the exchange , we paid a premium of $ 393 million , of which $ 225 million was paid in cash and $ 168 million was in the form of new notes . this premium , in addition to $ 194 million in remaining unamortized discounts related to the old notes , will be amortized as additional interest expense over the term of the new notes using the effective interest method . we may , at our option , redeem some or all of the new notes at any time by paying the principal amount of notes being redeemed plus a make-whole premium and accrued and unpaid interest . interest on the new notes is payable on june 15 and december 15 of each year , beginning on june 15 , 2013 . the new notes are unsecured senior obligations and rank equally in right of payment with all of our existing and future unsecured and unsubordinated indebtedness . in september 2011 , we issued $ 2.0 billion of long-term notes in a registered public offering and in october 2011 , we used a portion of the proceeds to redeem all of our $ 500 million long-term notes maturing in 2013 . in 2011 , we repurchased $ 84 million of our long-term notes through open-market purchases . we paid premiums of $ 48 million in connection with the early extinguishments of debt , which were recognized in other non-operating income ( expense ) , net . at december 31 , 2013 and 2012 , we had in place with a group of banks a $ 1.5 billion revolving credit facility that expires in august 2016 . we may request and the banks may grant , at their discretion , an increase to the credit facility by an additional amount up to $ 500 million . there were no borrowings outstanding under the credit facility through december 31 , 2013 . borrowings under the credit facility would be unsecured and bear interest at rates based , at our option , on a eurodollar rate or a base rate , as defined in the credit facility . each bank 2019s obligation to make loans under the credit facility is subject .