Raintree Marketing Corporation reported the following stockholders' equity at December 31 (adapted and in millions):
Common stock...........................................$ 365
Additional paid-in capital.................................286
Retained earnings.......................................3,190
Treasury stock ...........................................(690)
Total stockholders' equity............................$3,151
During the next year, Raintree Marketing purchased treasury stock at a cost of $34 million and resold treasury stock for $15 million (this treasury stock had cost Raintree Marketing $6 million). Record the purchase and resale of Raintree Marketing's treasury stock. Overall, how much did stockholders' equity increase or decrease as a result of the two treasury-stock transactions?