Financial report context:
devon energy corporation and subsidiaries notes to consolidated financial statements 2013 ( continued ) debt maturities as of december 31 , 2015 , excluding premiums and discounts , are as follows ( millions ) : .

Financial table:
2016: 2017; $ 976: 2014
2016: 2018; $ 976: 875
2016: 2019; $ 976: 1100
2016: 2020; $ 976: 414
2016: thereafter; $ 976: 9763
2016: total; $ 976: $ 13128

Additional report context:
credit lines devon has a $ 3.0 billion 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 , 2015 , 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% ( 65 % ) . 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 , 2015 , devon was in compliance with this covenant with a debt-to- capitalization ratio of 23.7% ( 23.7 % ) . commercial paper devon 2019s senior credit facility supports its $ 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 , 2015 , devon 2019s outstanding commercial paper borrowings had a weighted-average borrowing rate of 0.63% ( 0.63 % ) . issuance of senior notes in june 2015 , devon issued $ 750 million of 5.0% ( 5.0 % ) senior notes due 2045 that are unsecured and unsubordinated obligations . devon used the net proceeds to repay the floating rate senior notes that matured on december 15 , 2015 , as well as outstanding commercial paper balances . in december 2015 , in conjunction with the announcement of the powder river basin and stack acquisitions , devon issued $ 850 million of 5.85% ( 5.85 % ) senior notes due 2025 that are unsecured and unsubordinated obligations . devon used the net proceeds to fund the cash portion of these acquisitions. .

Question: in millions , what was the mathematical range of debt maturities for 2018-2020?
Answer: 686