Key words "De-Risking", "Mark to Market" & Pension Buyouts.
Ford on Buyouts: http://en.terra.com/news/news/exclusive_ford_readies_first_set_of_landmark_pension_buyouts/act481007
Ford "Mark to Market": http://www.pionline.com/article/20160107/ONLINE/160109913/ford-moves-to-mark-to-market-accounting-for-pension-funds
Ford and GM Pension Liabilities Compared with some great graphs: http://www.pionline.com/article/20160107/ONLINE/160109913/ford-moves-to-mark-to-market-accounting-for-pension-funds
http://www.fool.com/investing/general/2015/06/24/1-thing-you-might-not-know-ford-general-motors.aspx