...The negative outlook on Navient Corp. reflects the risks S&P Global Ratings sees stemming from Navient's concentration of large unsecured debt maturities in 2018-2020. Approximately $6.5 billion of unsecured debt will mature in 2018¡2020, including about $1.9 billion in June 2018, followed by $1.2 billion in January 2019. We expect Navient will generate at least $1.5 billion per year in cash from operations and will maintain on-balance-sheet cash sufficient to cover all unsecured debt maturing in 2017. Furthermore, we expect the company to maintain a risk-adjusted capital (RAC) ratio over 8.0%. We could lower the ratings in the next six to 10 months if Navient does not reduce unsecured debt due in 2018-2019 or increase liquid assets to more clearly demonstrate that it is well-positioned to meet its 2018-2020 maturities. If unfavorable market conditions restrict Navient's ability to continue to enhance its liquidity and manage upcoming maturities, we could lower the rating, particularly...