(a) Compute the missing balance sheet amounts for each of the three years shown. Current Long-term ($ millions) Assets Assets Total Assets Current Liabilities Long-term Liabilities Total Liabilities Stockholders' Equity 2013 $12,733 $ 0 $33,550 $ 0 $8,104 $15,602 $17,948 2014 12,303 18,906 0 5,964 12,103 0 13,142 2015 0 21,732 32,718 -7,118 13,853 20,971 0