Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31: Pension Benefits Health Care Benefits 2014 2013 2012 2014 2013 2012 Discount rate* 4.83% 4.12% 5.11% 4.38% 3.71% 4.66% Expected long-term return on plan assets* 6.86% 8.41% 8.43% —% —% —% Assumed health care cost trend rates at December 31: Health care cost trend rate assumed for next year N/A N/A N/A 7.02% 7.39% 8.35% Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) N/A N/A N/A 4.50% 4.63% 5.00% Year that the rate reaches the ultimate trend rate N/A N/A N/A 2027 2025 2019 * The mark-to-market component of net periodic costs is determined based on discount rates as of year end and actual asset returns during the year.