{"pre_text": ["- the increase in level 3 short-term borrowings and long-term debt of $ 2.8 billion and $ 7.3 billion , respectively , resulted from transfers in of level 2 positions as prices and other valuation inputs became unobservable , plus the additions of new issuances for fair value accounting was elected .", "items measured at fair value on a nonrecurring basis certain assets and liabilities are measured at fair value on a nonrecurring basis and therefore are not included in the tables above .", "these include assets measured at cost that have been written down to fair value during the periods as a result of an impairment .", "in addition , assets such as loans held for sale that are measured at the lower of cost or market ( locom ) that were recognized at fair value below cost at the end of the period .", "the company recorded goodwill impairment charges of $ 9.6 billion as of december 31 , 2008 , as determined based on level 3 inputs .", "the primary cause of goodwill impairment was the overall weak industry outlook and continuing operating losses .", "these factors contributed to the overall decline in the stock price and the related market capitalization of citigroup .", "see note 19 , 201cgoodwill and intangible assets 201d on page 166 , for additional information on goodwill impairment .", "the company performed an impairment analysis of intangible assets related to the old lane multi-strategy hedge fund during the first quarter of 2008 .", "as a result , a pre-tax write-down of $ 202 million , representing the remaining unamortized balance of the intangible assets , was recorded during the first quarter of 2008 .", "the measurement of fair value was determined using level 3 input factors along with a discounted cash flow approach .", "during the fourth quarter of 2008 , the company performed an impairment analysis of japan's nikko asset management fund contracts which represent the rights to manage and collect fees on investor assets and are accounted for as indefinite-lived intangible assets .", "as a result , an impairment loss of $ 937 million pre-tax was recorded .", "the related fair value was determined using an income approach which relies on key drivers and future expectations of the business that are considered level 3 input factors .", "the fair value of loans measured on a locom basis is determined where possible using quoted secondary-market prices .", "such loans are generally classified in level 2 of the fair-value hierarchy given the level of activity in the market and the frequency of available quotes .", "if no such quoted price exists , the fair value of a loan is determined using quoted prices for a similar asset or assets , adjusted for the specific attributes of that loan .", "the following table presents all loans held-for-sale that are carried at locom as of december 31 , 2008 and december 31 , 2007 ( in billions ) : ."], "post_text": ["loans held-for-sale that are carried at locom as of december 31 , 2008 significantly declined compared to december 31 , 2007 because most of these loans were either sold or reclassified to held-for-investment category. ."], "table": [["", "aggregate cost", "fair value", "level 2", "level 3"], ["december 31 2008", "$ 3.1", "$ 2.1", "$ 0.8", "$ 1.3"], ["december 31 2007", "33.6", "31.9", "5.1", "26.8"]], "table_ori": [["", "Aggregate cost", "Fair value", "Level 2", "Level 3"], ["December 31, 2008", "$3.1", "$2.1", "$0.8", "$1.3"], ["December 31, 2007", "33.6", "31.9", "5.1", "26.8"]]}

Question: at december 312008 what was the difference between the aggregate and the fair value of the loans held-for-sale that are carried at locom in billions
Evidence:
table_1: the december 31 2008 of aggregate cost is $ 3.1 ; the december 31 2008 of fair value is $ 2.1 ; the december 31 2008 of level 2 is $ 0.8 ; the december 31 2008 of level 3 is $ 1.3 ;
Program: subtract(3.1, 2.1)
Answer:
str_answer: 1
exe_answer: 1