{"pre_text": ["an institution rated single-a by the credit rating agencies .", "given the illiquid nature of many of these types of investments , it can be a challenge to determine their fair values .", "see note 7 fair value in the notes to consolidated financial statements in item 8 of this report for additional information .", "various pnc business units manage our equity and other investment activities .", "our businesses are responsible for making investment decisions within the approved policy limits and associated guidelines .", "a summary of our equity investments follows : table 48 : equity investments summary in millions december 31 december 31 ."], "post_text": ["blackrock pnc owned approximately 35 million common stock equivalent shares of blackrock equity at december 31 , 2015 , accounted for under the equity method .", "the primary risk measurement , similar to other equity investments , is economic capital .", "the business segments review section of this item 7 includes additional information about blackrock .", "tax credit investments included in our equity investments are direct tax credit investments and equity investments held by consolidated partnerships which totaled $ 2.3 billion at december 31 , 2015 and $ 2.6 billion at december 31 , 2014 .", "these equity investment balances include unfunded commitments totaling $ 669 million and $ 717 million at december 31 , 2015 and december 31 , 2014 , respectively .", "these unfunded commitments are included in other liabilities on our consolidated balance sheet .", "note 2 loan sale and servicing activities and variable interest entities in the notes to consolidated financial statements in item 8 of this report has further information on tax credit investments .", "private equity the private equity portfolio is an illiquid portfolio comprised of mezzanine and equity investments that vary by industry , stage and type of investment .", "private equity investments carried at estimated fair value totaled $ 1.4 billion at december 31 , 2015 and $ 1.6 billion at december 31 , 2014 .", "as of december 31 , 2015 , $ 1.1 billion was invested directly in a variety of companies and $ .3 billion was invested indirectly through various private equity funds .", "included in direct investments are investment activities of two private equity funds that are consolidated for financial reporting purposes .", "the noncontrolling interests of these funds totaled $ 170 million as of december 31 , 2015 .", "the interests held in indirect private equity funds are not redeemable , but pnc may receive distributions over the life of the partnership from liquidation of the underlying investments .", "see item 1 business 2013 supervision and regulation and item 1a risk factors of this report for discussion of the potential impacts of the volcker rule provisions of dodd-frank on our interests in and of private funds covered by the volcker rule .", "in 2015 , pnc invested with six other banks in early warning services ( ews ) , a provider of fraud prevention and risk management solutions .", "ews then acquired clearxchange , a network through which customers send and receive person-to- person payments .", "integrating these businesses will enable us to , among other things , create a secure , real-time payments network .", "our unfunded commitments related to private equity totaled $ 126 million at december 31 , 2015 compared with $ 140 million at december 31 , 2014 .", "see note 7 fair value , note 20 legal proceedings and note 21 commitments and guarantees in the notes to consolidated financial statements in item 8 of this report for additional information regarding the october 2007 visa restructuring , our involvement with judgment and loss sharing agreements with visa and certain other banks , the status of pending interchange litigation , the sales of portions of our visa class b common shares and the related swap agreements with the purchasers .", "during 2015 , we sold 2.0 million visa class b common shares , in addition to the 16.5 million shares sold in previous years .", "we have entered into swap agreements with the purchasers of the shares as part of these sales .", "see note 7 fair value in the notes to consolidated financial statements in item 8 of this report for additional information .", "at december 31 , 2015 , our investment in visa class b common shares totaled approximately 4.9 million shares and had a carrying value of $ 31 million .", "based on the december 31 , 2015 closing price of $ 77.55 for the visa class a common shares , the fair value of our total investment was approximately $ 622 million at the current conversion rate .", "the visa class b common shares that we own are transferable only under limited circumstances until they can be converted into shares of the publicly traded class of stock , which cannot happen until the settlement of all of the specified litigation .", "90 the pnc financial services group , inc .", "2013 form 10-k ."], "table": [["in millions", "december 312015", "december 312014"], ["blackrock", "$ 6626", "$ 6265"], ["tax credit investments", "2254", "2616"], ["private equity", "1441", "1615"], ["visa", "31", "77"], ["other", "235", "155"], ["total", "$ 10587", "$ 10728"]], "table_ori": [["In millions", "December 312015", "December 312014"], ["BlackRock", "$6,626", "$6,265"], ["Tax credit investments", "2,254", "2,616"], ["Private equity", "1,441", "1,615"], ["Visa", "31", "77"], ["Other", "235", "155"], ["Total", "$10,587", "$10,728"]]}

Question: what was the change in private equity investments carried at estimated fair value between december 31 , 2015 and december 31 , 2014 , in billions?
Evidence:
text_14: private equity investments carried at estimated fair value totaled $ 1.4 billion at december 31 , 2015 and $ 1.6 billion at december 31 , 2014 .
Program: subtract(1.6, 1.4)
Answer:
str_answer: 0.2
exe_answer: 0.2