{"pre_text": ["notes to consolidated financial statements jpmorgan chase & co./2009 annual report 204 on the amount of interest income recognized in the firm 2019s consolidated statements of income since that date .", "( b ) other changes in expected cash flows include the net impact of changes in esti- mated prepayments and reclassifications to the nonaccretable difference .", "on a quarterly basis , the firm updates the amount of loan principal and interest cash flows expected to be collected , incorporating assumptions regarding default rates , loss severities , the amounts and timing of prepayments and other factors that are reflective of current market conditions .", "probable decreases in expected loan principal cash flows trigger the recognition of impairment , which is then measured as the present value of the expected principal loss plus any related foregone interest cash flows discounted at the pool 2019s effective interest rate .", "impairments that occur after the acquisition date are recognized through the provision and allow- ance for loan losses .", "probable and significant increases in expected principal cash flows would first reverse any previously recorded allowance for loan losses ; any remaining increases are recognized prospectively as interest income .", "the impacts of ( i ) prepayments , ( ii ) changes in variable interest rates , and ( iii ) any other changes in the timing of expected cash flows are recognized prospectively as adjustments to interest income .", "disposals of loans , which may include sales of loans , receipt of payments in full by the borrower , or foreclosure , result in removal of the loan from the purchased credit-impaired portfolio .", "if the timing and/or amounts of expected cash flows on these purchased credit-impaired loans were determined not to be rea- sonably estimable , no interest would be accreted and the loans would be reported as nonperforming loans ; however , since the timing and amounts of expected cash flows for these purchased credit-impaired loans are reasonably estimable , interest is being accreted and the loans are being reported as performing loans .", "charge-offs are not recorded on purchased credit-impaired loans until actual losses exceed the estimated losses that were recorded as purchase accounting adjustments at acquisition date .", "to date , no charge-offs have been recorded for these loans .", "purchased credit-impaired loans acquired in the washington mu- tual transaction are reported in loans on the firm 2019s consolidated balance sheets .", "in 2009 , an allowance for loan losses of $ 1.6 billion was recorded for the prime mortgage and option arm pools of loans .", "the net aggregate carrying amount of the pools that have an allowance for loan losses was $ 47.2 billion at december 31 , 2009 .", "this allowance for loan losses is reported as a reduction of the carrying amount of the loans in the table below .", "the table below provides additional information about these pur- chased credit-impaired consumer loans. ."], "post_text": ["( a ) represents the sum of contractual principal , interest and fees earned at the reporting date .", "purchased credit-impaired loans are also being modified under the mha programs and the firm 2019s other loss mitigation programs .", "for these loans , the impact of the modification is incorporated into the firm 2019s quarterly assessment of whether a probable and/or signifi- cant change in estimated future cash flows has occurred , and the loans continue to be accounted for as and reported as purchased credit-impaired loans .", "foreclosed property the firm acquires property from borrowers through loan restructur- ings , workouts , and foreclosures , which is recorded in other assets on the consolidated balance sheets .", "property acquired may include real property ( e.g. , land , buildings , and fixtures ) and commercial and personal property ( e.g. , aircraft , railcars , and ships ) .", "acquired property is valued at fair value less costs to sell at acquisition .", "each quarter the fair value of the acquired property is reviewed and adjusted , if necessary .", "any adjustments to fair value in the first 90 days are charged to the allowance for loan losses and thereafter adjustments are charged/credited to noninterest revenue 2013other .", "operating expense , such as real estate taxes and maintenance , are charged to other expense .", "note 14 2013 allowance for credit losses the allowance for loan losses includes an asset-specific component , a formula-based component and a component related to purchased credit-impaired loans .", "the asset-specific component relates to loans considered to be impaired , which includes any loans that have been modified in a troubled debt restructuring as well as risk-rated loans that have been placed on nonaccrual status .", "an asset-specific allowance for impaired loans is established when the loan 2019s discounted cash flows ( or , when available , the loan 2019s observable market price ) is lower than the recorded investment in the loan .", "to compute the asset-specific component of the allowance , larger loans are evaluated individually , while smaller loans are evaluated as pools using historical loss experience for the respective class of assets .", "risk-rated loans ( primarily wholesale loans ) are pooled by risk rating , while scored loans ( i.e. , consumer loans ) are pooled by product type .", "the firm generally measures the asset-specific allowance as the difference between the recorded investment in the loan and the present value of the cash flows expected to be collected , dis- counted at the loan 2019s original effective interest rate .", "subsequent changes in measured impairment due to the impact of discounting are reported as an adjustment to the provision for loan losses , not as an adjustment to interest income .", "an asset-specific allowance for an impaired loan with an observable market price is measured as the difference between the recorded investment in the loan and the loan 2019s fair value .", "certain impaired loans that are determined to be collateral- dependent are charged-off to the fair value of the collateral less costs to sell .", "when collateral-dependent commercial real-estate loans are determined to be impaired , updated appraisals are typi- cally obtained and updated every six to twelve months .", "the firm also considers both borrower- and market-specific factors , which ."], "table": [["december 31 ( in millions )", "2009", "2008"], ["outstanding balance ( a )", "$ 103369", "$ 118180"], ["carrying amount", "79664", "88813"]], "table_ori": [["December 31, (in millions)", "2009", "2008"], ["Outstanding balance<sup>(a)</sup>", "$103,369", "$118,180"], ["Carrying amount", "79,664", "88,813"]]}

Question: for 2009 , what was the net reserve allowance on the prime mortgage and option arm pools of loans , in millions?\\n
Evidence:
table_1: december 31 ( in millions ) the outstanding balance ( a ) of 2009 is $ 103369 ; the outstanding balance ( a ) of 2008 is $ 118180 ;
table_2: december 31 ( in millions ) the carrying amount of 2009 is 79664 ; the carrying amount of 2008 is 88813 ;
Program: subtract(103369, 79664)
Answer:
str_answer: 23705
exe_answer: 23705