Pension Benefits OPEB Year U.S. Non-U.S. Non-U.S. 2015 $ 132 $ 14 $ 5 2016 127 15 6 2017 123 16 6 2018 120 16 6 2019 116 16 6 2020 to 2024 555 113 30 Total $ 1,173 $ 190 $ 59 U.S. government securities include bonds issued by government-sponsored agencies and  Treasury notes. Corporate  securities include primarily debt securities. Other consists of investments in mutual and index funds. U.S. government  securities, corporate debt and certificates of deposit maturing in one year or less, after one year through five years and after five  years through ten years total $32, $64 and $1 at December 31, 2014. 69 The Pension Protection Act (PPA) defines a zone status for each plan. Plans in the green zone are at least  80% funded,  plans in the yellow zone are at least 65% funded and plans in the red zone are generally less than  65% funded. The SPT plan  has utilized extended amortization provisions to amortize its losses from 2008.The plan recertified its zone status after using  the extended amortization provisions as allowed by law . The SPT plan has not implemented a funding improvement or  rehabilitation plan, nor are such plans pending. Our contributions to the SPT  have not exceeded 5% of the total contributions to  the plan. Contributions in 2014 increased by approximately  5% after decreasing in 2013 as a result of plant closings and  decreased employment levels.  Multiemployer pension plans  — We participate in the Steelworkers Pension Trust (SPT) multiemployer pension plan which  provides pension benefits to substantially all of our U.S. union-represented employees.We also have a small participation in  the IAM National Pension Fund. Benefit levels are set by trustees who manage the plans. Contributions are made in  accordance with our collective bargaining agreements and rates are generally based on hours worked.The collective  bargaining agreement expires May 31, 2017. The trustees of the SPT have provided us with the latest data available for the  plan year ended December 31, 2014. As of that date, the plan is not fully funded.We could be held liable to the plan for our  obligations as well as those of other employers as a result of our participation in the plan. Contribution rates could increase if  the plan is required to adopt a funding improvement plan or a rehabilitation plan, if the performance of plan assets does not  meet expectations or as a result of future collectively bar gained wage and benefit agreements. If we choose to stop  participating in the plan, we may be required to pay the plan an amount based on the underfunded status of the plan, referred to  as a withdrawal liability. Pension benefits are funded through deposits with trustees that satisfy , at a minimum, the applicable funding regulations.  OPEB benefits are funded as they become due. Projected contributions to be made during  2015 to the defined benefit pension  plans are $13 for our non-U.S. plans. Based on the current funded status of our U.S. plans, there are  no minimum contributions  required for 2015. Note 12. Marketable Securities Employer Identification Number/ Plan Number PPA Zone Status Funding Plan  Pending/ Implemented Contributions by Dana Surcharge Imposed Pension Fund 2014 2013 2014 2013 2012 SPT 23-6648508 / 499 Green Green No $ 9 $ 9 $ 10 No 2014 2013 Cost Unrealized Gains  (Losses) Fair Value Cost Unrealized Gains  (Losses) Fair Value U.S. government securities $ 38 $ — $ 38 $ 27 $ — $ 27 Corporate securities 36 36 30 (1) 29 Certificates of deposit 23 23 21 21 Other 67 5 72 31 2 33 Total marketable securities $ 164 $ 5 $ 169 $ 109 $ 1 $ 110