recourse and repurchase obligations as discussed in note 3 loans sale and servicing activities and variable interest entities , pnc has sold commercial mortgage and residential mortgage loans directly or indirectly in securitizations and whole-loan sale transactions with continuing involvement . one form of continuing involvement includes certain recourse and loan repurchase obligations associated with the transferred assets in these transactions . commercial mortgage loan recourse obligations we originate , close and service certain multi-family commercial mortgage loans which are sold to fnma under fnma 2019s dus program . we participated in a similar program with the fhlmc . under these programs , we generally assume up to a one-third pari passu risk of loss on unpaid principal balances through a loss share arrangement . at december 31 , 2011 and december 31 , 2010 , the unpaid principal balance outstanding of loans sold as a participant in these programs was $ 13.0 billion and $ 13.2 billion , respectively . the potential maximum exposure under the loss share arrangements was $ 4.0 billion at both december 31 , 2011 and december 31 , 2010 . we maintain a reserve for estimated losses based upon our exposure . the reserve for losses under these programs totaled $ 47 million and $ 54 million as of december 31 , 2011 and december 31 , 2010 , respectively , and is included in other liabilities on our consolidated balance sheet . if payment is required under these programs , we would not have a contractual interest in the collateral underlying the mortgage loans on which losses occurred , although the value of the collateral is taken into account in determining our share of such losses . our exposure and activity associated with these recourse obligations are reported in the corporate & institutional banking segment . analysis of commercial mortgage recourse obligations .
during 2011 , what was the change in reserve for estimated losses included in other liabilities on our consolidated balance sheet?
residential mortgage loan and home equity repurchase obligations while residential mortgage loans are sold on a non-recourse basis , we assume certain loan repurchase obligations associated with mortgage loans we have sold to investors . these loan repurchase obligations primarily relate to situations where pnc is alleged to have breached certain origination covenants and representations and warranties made to purchasers of the loans in the respective purchase and sale agreements . residential mortgage loans covered by these loan repurchase obligations include first and second-lien mortgage loans we have sold through agency securitizations , non-agency securitizations , and whole-loan sale transactions . as discussed in note 3 in this report , agency securitizations consist of mortgage loans sale transactions with fnma , fhlmc , and gnma , while non-agency securitizations and whole-loan sale transactions consist of mortgage loans sale transactions with private investors . our historical exposure and activity associated with agency securitization repurchase obligations has primarily been related to transactions with fnma and fhlmc , as indemnification and repurchase losses associated with fha and va-insured and uninsured loans pooled in gnma securitizations historically have been minimal . repurchase obligation activity associated with residential mortgages is reported in the residential mortgage banking segment . pnc 2019s repurchase obligations also include certain brokered home equity loans/lines that were sold to a limited number of private investors in the financial services industry by national city prior to our acquisition . pnc is no longer engaged in the brokered home equity lending business , and our exposure under these loan repurchase obligations is limited to repurchases of whole-loans sold in these transactions . repurchase activity associated with brokered home equity loans/lines is reported in the non-strategic assets portfolio segment . loan covenants and representations and warranties are established through loan sale agreements with various investors to provide assurance that pnc has sold loans to investors of sufficient investment quality . key aspects of such covenants and representations and warranties include the loan 2019s compliance with any applicable loan criteria established by the investor , including underwriting standards , delivery of all required loan documents to the investor or its designated party , sufficient collateral valuation , and the validity of the lien securing the loan . as a result of alleged breaches of these contractual obligations , investors may request pnc to indemnify them against losses on certain loans or to repurchase loans . these investor indemnification or repurchase claims are typically settled on an individual loan basis through make- whole payments or loan repurchases ; however , on occasion we may negotiate pooled settlements with investors . indemnifications for loss or loan repurchases typically occur when , after review of the claim , we agree insufficient evidence exists to dispute the investor 2019s claim that a breach of a loan covenant and representation and warranty has occurred , such breach has not been cured , and the effect of such breach is deemed to have had a material and adverse effect on the value of the transferred loan . depending on the sale agreement and upon proper notice from the investor , we typically respond to such indemnification and repurchase requests within 60 days , although final resolution of the claim may take a longer period of time . with the exception of the sales the pnc financial services group , inc . 2013 form 10-k 199 .