as of december 31 , 2014 and 2013 , 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 2011 , other than with respect to refunds .
u.s .
income taxes and foreign withholding taxes have not been provided on earnings of $ 291 million , $ 222 million and $ 211 million that have not been distributed by our non-u.s .
companies as of december 31 , 2014 , 2013 and 2012 .
our intention is to permanently reinvest these earnings , thereby indefinitely postponing their remittance to the u.s .
if these earnings had been remitted , we estimate that the additional income taxes after foreign tax credits would have been approximately $ 55 million in 2014 , $ 50 million in 2013 and $ 45 million in 2012 .
our federal and foreign income tax payments , net of refunds received , were $ 1.5 billion in 2014 , $ 787 million in 2013 and $ 890 million in 2012 .
our 2014 and 2013 net payments reflect a $ 200 million and $ 550 million refund from the irs primarily attributable to our tax-deductible discretionary pension contributions during the fourth quarters of 2013 and 2012 , and our 2012 net payments reflect a $ 153 million refund from the irs related to a 2011 capital loss carryback .
note 8 2013 debt our long-term debt consisted of the following ( in millions ) : .

2014
2013
Notes with rates from 2.13% to 6.15%, due 2016 to 2042
$5,642
$5,642
Notes with rates from 7.00% to 7.75%, due 2016 to 2036
916
916
Other debt
483
476
Total long-term debt
7,041
7,034
Less: unamortized discounts
(872)
(882)
Total long-term debt, net
$6,169
$6,152

in august 2014 , we entered into a new $ 1.5 billion revolving credit facility with a syndicate of banks and concurrently terminated our existing $ 1.5 billion revolving credit facility which was scheduled to expire in august 2016 .
the new credit facility expires august 2019 and we may request and the banks may grant , at their discretion , an increase to the new credit facility of up to an additional $ 500 million .
the credit facility also includes a sublimit of up to $ 300 million available for the issuance of letters of credit .
there were no borrowings outstanding under the new facility through december 31 , 2014 .
borrowings under the new 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 new credit facility .
each bank 2019s obligation to make loans under the credit facility is subject to , among other things , our compliance with various representations , warranties and covenants , including covenants limiting our ability and certain of our subsidiaries 2019 ability to encumber assets and a covenant not to exceed a maximum leverage ratio , as defined in the credit facility .
the leverage ratio covenant excludes the adjustments recognized in stockholders 2019 equity related to postretirement benefit plans .
as of december 31 , 2014 , we were in compliance with all covenants contained in the credit facility , as well as in our debt agreements .
we have agreements in place with financial institutions to provide for the issuance of commercial paper .
there were no commercial paper borrowings outstanding during 2014 or 2013 .
if we were to issue commercial paper , the borrowings would be supported by the credit facility .
in april 2013 , we repaid $ 150 million of long-term notes with a fixed interest rate of 7.38% ( 7.38 % ) due to their scheduled maturities .
during the next five years , we have scheduled long-term debt maturities of $ 952 million due in 2016 and $ 900 million due in 2019 .
interest payments were $ 326 million in 2014 , $ 340 million in 2013 and $ 378 million in 2012 .
all of our existing unsecured and unsubordinated indebtedness rank equally in right of payment .
note 9 2013 postretirement plans defined benefit pension plans and retiree medical and life insurance plans many of our employees are covered by qualified defined benefit pension plans and we provide certain health care and life insurance benefits to eligible retirees ( collectively , postretirement benefit plans ) .
we also sponsor nonqualified defined benefit pension plans to provide for benefits in excess of qualified plan limits .
non-union represented employees hired after december 2005 do not participate in our qualified defined benefit pension plans , but are eligible to participate in a qualified .

Question: Analyse this data from a financial earnings document. what was the change in millions of total long-term debt net between 2013 and 2014?
Choices:
17.0
6186
37951688
0
1700
Correct choice index: 0