Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


at december 31 , 2015 and 2014 , options for 5 million and 6 million shares of common stock were exercisable at a weighted-average price of $ 55.42 and $ 56.21 , respectively . the total intrinsic value of options exercised was approximately $ .1 billion during 2016 , 2015 and 2014 . cash received from option exercises under all incentive plans for 2016 , 2015 and 2014 was approximately $ .1 billion , $ .1 billion and $ .2 billion , respectively . the tax benefit realized from option exercises under all incentive plans was insignificant for 2016 , 2015 and 2014 . shares of common stock available during the next year for the granting of options and other awards under the incentive plans were approximately 39 million shares at december 31 , 2016 . total shares of pnc common stock authorized for future issuance under all equity compensation plans totaled approximately 40 million shares at december 31 , 2016 . during 2016 , we issued approximately 2 million common shares from treasury stock in connection with stock option exercise activity . as with past exercise activity , we currently intend to utilize primarily treasury stock for any future stock option exercises . incentive/performance unit awards and restricted share/restricted share unit awards the fair value of nonvested incentive/performance unit awards and restricted share/restricted share unit awards is initially determined based on prices not less than the market value of our common stock on the date of grant with a reduction for estimated forfeitures . the value of certain incentive/ performance unit awards is subsequently remeasured based on the achievement of one or more financial and other performance goals . additionally , certain incentive/ performance unit awards require subsequent adjustment to their current market value due to certain discretionary risk review triggers . the weighted-average grant date fair value of incentive/ performance unit awards and restricted share/restricted share unit awards granted in 2016 , 2015 and 2014 was $ 78.37 , $ 91.57 and $ 80.79 per share , respectively . the total intrinsic value of incentive/performance unit and restricted share/ restricted share unit awards vested during 2016 , 2015 and 2014 was approximately $ .1 billion , $ .2 billion and $ .1 billion , respectively . we recognize compensation expense for such awards ratably over the corresponding vesting and/or performance periods for each type of program . table 78 : nonvested incentive/performance unit awards and restricted share/restricted share unit awards 2013 rollforward ( a ) shares in millions nonvested incentive/ performance units shares weighted- average date fair nonvested restricted share/ restricted weighted- average grant date fair value . <table class='wikitable'><tr><td>1</td><td>shares in millions december 31 2015</td><td>nonvested incentive/ performance units shares 2</td><td>weighted- average grant date fair value $ 79.27</td><td>nonvested restricted share/ restricted share units 3</td><td>weighted- average grant date fair value $ 79.26</td></tr><tr><td>2</td><td>granted ( b )</td><td>1</td><td>$ 77.77</td><td>1</td><td>$ 78.71</td></tr><tr><td>3</td><td>vested/released ( b )</td><td>-1 ( 1 )</td><td>$ 71.59</td><td>-1 ( 1 )</td><td>$ 65.53</td></tr><tr><td>4</td><td>december 31 2016</td><td>2</td><td>$ 81.42</td><td>3</td><td>$ 83.27</td></tr></table> ( a ) forfeited awards during 2016 were insignificant . ( b ) includes adjustments for achieving specific performance goals for incentive/ performance unit share awards granted in prior periods . in table 78 , the units and related weighted-average grant date fair value of the incentive/performance unit share awards exclude the effect of dividends on the underlying shares , as those dividends will be paid in cash if and when the underlying shares are issued to the participants . blackrock long-term incentive plans ( ltip ) blackrock adopted the 2002 ltip program to help attract and retain qualified professionals . at that time , we agreed to transfer up to four million shares of blackrock common stock to fund a portion of the 2002 ltip program and future ltip programs approved by blackrock 2019s board of directors . in 2009 , our obligation to deliver any remaining blackrock common shares was replaced with an obligation to deliver shares of blackrock 2019s series c preferred stock held by us . in 2016 , we transferred .5 million shares of blackrock series c preferred stock to blackrock in connection with our obligation . at december 31 , 2016 , we held approximately .8 million shares of blackrock series c preferred stock which were available to fund our obligations . see note 23 subsequent events for information on our february 1 , 2017 transfer of .5 million shares of the series c preferred stock to blackrock to satisfy a portion of our ltip obligation . we account for our blackrock series c preferred stock at fair value , which offsets the impact of marking-to-market the obligation to deliver these shares to blackrock . see note 6 fair value for additional information regarding the valuation of the blackrock series c preferred stock . the pnc financial services group , inc . 2013 form 10-k 139 .
Question: what was the intrinsic value of incentive/performance unit and restricted share/ restricted share unit awards vested during 2016, in billions?
Answer: 0.1
Question: what was the intrinsic value of incentive/performance unit and restricted share/ restricted share unit awards vested during 2015, in billions?

0.2