{"pre_text": ["note 10 loan sales and securitizations loan sales we sell residential and commercial mortgage loans in loan securitization transactions sponsored by government national mortgage association ( gnma ) , fnma , and fhlmc and in certain instances to other third-party investors .", "gnma , fnma , and the fhlmc securitize our transferred loans into mortgage-backed securities for sale into the secondary market .", "generally , we do not retain any interest in the transferred loans other than mortgage servicing rights .", "refer to note 9 goodwill and other intangible assets for further discussion on our residential and commercial mortgage servicing rights assets .", "during 2009 , residential and commercial mortgage loans sold totaled $ 19.8 billion and $ 5.7 billion , respectively .", "during 2008 , commercial mortgage loans sold totaled $ 3.1 billion .", "there were no residential mortgage loans sales in 2008 as these activities were obtained through our acquisition of national city .", "our continuing involvement in these loan sales consists primarily of servicing and limited repurchase obligations for loan and servicer breaches in representations and warranties .", "generally , we hold a cleanup call repurchase option for loans sold with servicing retained to the other third-party investors .", "in certain circumstances as servicer , we advance principal and interest payments to the gses and other third-party investors and also may make collateral protection advances .", "our risk of loss in these servicing advances has historically been minimal .", "we maintain a liability for estimated losses on loans expected to be repurchased as a result of breaches in loan and servicer representations and warranties .", "we have also entered into recourse arrangements associated with commercial mortgage loans sold to fnma and fhlmc .", "refer to note 25 commitments and guarantees for further discussion on our repurchase liability and recourse arrangements .", "our maximum exposure to loss in our loan sale activities is limited to these repurchase and recourse obligations .", "in addition , for certain loans transferred in the gnma and fnma transactions , we hold an option to repurchase individual delinquent loans that meet certain criteria .", "without prior authorization from these gses , this option gives pnc the ability to repurchase the delinquent loan at par .", "under gaap , once we have the unilateral ability to repurchase the delinquent loan , effective control over the loan has been regained and we are required to recognize the loan and a corresponding repurchase liability on the balance sheet regardless of our intent to repurchase the loan .", "at december 31 , 2009 and december 31 , 2008 , the balance of our repurchase option asset and liability totaled $ 577 million and $ 476 million , respectively .", "securitizations in securitizations , loans are typically transferred to a qualifying special purpose entity ( qspe ) that is demonstrably distinct from the transferor to transfer the risk from our consolidated balance sheet .", "a qspe is a bankruptcy-remote trust allowed to perform only certain passive activities .", "in addition , these entities are self-liquidating and in certain instances are structured as real estate mortgage investment conduits ( remics ) for tax purposes .", "the qspes are generally financed by issuing certificates for various levels of senior and subordinated tranches .", "qspes are exempt from consolidation provided certain conditions are met .", "our securitization activities were primarily obtained through our acquisition of national city .", "credit card receivables , automobile , and residential mortgage loans were securitized through qspes sponsored by ncb .", "these qspes were financed primarily through the issuance and sale of beneficial interests to independent third parties and were not consolidated on our balance sheet at december 31 , 2009 or december 31 , 2008 .", "however , see note 1 accounting policies regarding accounting guidance that impacts the accounting for these qspes effective january 1 , 2010 .", "qualitative and quantitative information about the securitization qspes and our retained interests in these transactions follow .", "the following summarizes the assets and liabilities of the securitization qspes associated with securitization transactions that were outstanding at december 31 , 2009. ."], "post_text": ["( a ) represents period-end outstanding principal balances of loans transferred to the securitization qspes .", "credit card loans at december 31 , 2009 , the credit card securitization series 2005-1 , 2006-1 , 2007-1 , and 2008-3 were outstanding .", "during the fourth quarter of 2009 , the 2008-1 and 2008-2 credit card securitization series matured .", "our continuing involvement in the securitized credit card receivables consists primarily of servicing and our holding of certain retained interests .", "servicing fees earned approximate current market rates for servicing fees ; therefore , no servicing asset or liability is recognized .", "we hold a clean-up call repurchase option to the extent a securitization series extends past its scheduled note principal payoff date .", "to the extent this occurs , the clean-up call option is triggered when the principal balance of the asset- backed notes of any series reaches 5% ( 5 % ) of the initial principal balance of the asset-backed notes issued at the securitization ."], "table": [["in millions", "december 31 2009 credit card", "december 31 2009 mortgage", "december 31 2009 credit card", "mortgage"], ["assets ( a )", "$ 2368", "$ 232", "$ 2129", "$ 319"], ["liabilities", "1622", "232", "1824", "319"]], "table_ori": [["", "December 31, 2009", "December 31,2008"], ["In millions", "Credit Card", "Mortgage", "Credit Card", "Mortgage"], ["Assets (a)", "$2,368", "$232", "$2,129", "$319"], ["Liabilities", "1,622", "232", "1,824", "319"]]}

Question: for how much more was the 2009 residential loan sold than the 2008 and 2009 commercial loans combined , in billions?
Evidence:
text_4: during 2009 , residential and commercial mortgage loans sold totaled $ 19.8 billion and $ 5.7 billion , respectively .
text_5: during 2008 , commercial mortgage loans sold totaled $ 3.1 billion .
Program: add(5.7, 3.1), subtract(19.8, #0)
Answer:
str_answer: 10
exe_answer: 11