devon energy corporation and subsidiaries notes to consolidated financial statements 2013 ( continued ) debt maturities as of december 31 , 2014 , excluding premiums and discounts , are as follows ( in millions ) : .
at december 31 , 2014 what was the ratio of the debt maturities scheduled for 2015 to 2018
credit lines devon has a $ 3.0 billion syndicated , unsecured revolving line of credit ( the senior credit facility ) . the maturity date for $ 30 million of the senior credit facility is october 24 , 2017 . the maturity date for $ 164 million of the senior credit facility is october 24 , 2018 . the maturity date for the remaining $ 2.8 billion is october 24 , 2019 . amounts borrowed under the senior credit facility may , at the election of devon , bear interest at various fixed rate options for periods of up to twelve months . such rates are generally less than the prime rate . however , devon may elect to borrow at the prime rate . the senior credit facility currently provides for an annual facility fee of $ 3.8 million that is payable quarterly in arrears . as of december 31 , 2014 , there were no borrowings under the senior credit facility . the senior credit facility contains only one material financial covenant . this covenant requires devon 2019s ratio of total funded debt to total capitalization , as defined in the credit agreement , to be no greater than 65 percent . the credit agreement contains definitions of total funded debt and total capitalization that include adjustments to the respective amounts reported in the accompanying consolidated financial statements . also , total capitalization is adjusted to add back noncash financial write-downs such as full cost ceiling impairments or goodwill impairments . as of december 31 , 2014 , devon was in compliance with this covenant with a debt-to- capitalization ratio of 20.9 percent . commercial paper devon has access to $ 3.0 billion of short-term credit under its commercial paper program . commercial paper debt generally has a maturity of between 1 and 90 days , although it can have a maturity of up to 365 days , and bears interest at rates agreed to at the time of the borrowing . the interest rate is generally based on a standard index such as the federal funds rate , libor or the money market rate as found in the commercial paper market . as of december 31 , 2014 , devon 2019s commercial paper borrowings of $ 932 million have a weighted- average borrowing rate of 0.44 percent . retirement of senior notes on november 13 , 2014 , devon redeemed $ 1.9 billion of senior notes prior to their scheduled maturity , primarily with proceeds received from its asset divestitures . the redemption includes the 2.4% ( 2.4 % ) $ 500 million senior notes due 2016 , the 1.2% ( 1.2 % ) $ 650 million senior notes due 2016 and the 1.875% ( 1.875 % ) $ 750 million senior notes due 2017 . the notes were redeemed for $ 1.9 billion , which included 100 percent of the principal amount and a make-whole premium of $ 40 million . on the date of redemption , these notes also had an unamortized discount of $ 2 million and unamortized debt issuance costs of $ 6 million . the make-whole premium , unamortized discounts and debt issuance costs are included in net financing costs on the accompanying 2014 consolidated comprehensive statement of earnings. .