considering the years 2008 and 2009 , what is the variation observed in the foreign currency translation , in millions?
at december 31 , 2009 , aon had domestic federal operating loss carryforwards of $ 7 million that will expire at various dates from 2010 to 2024 , state operating loss carryforwards of $ 513 million that will expire at various dates from 2010 to 2028 , and foreign operating and capital loss carryforwards of $ 453 million and $ 252 million , respectively , nearly all of which are subject to indefinite carryforward . unrecognized tax benefits the following is a reconciliation of the company 2019s beginning and ending amount of unrecognized tax benefits ( in millions ) : .

|  | 2009 | 2008 |
| :--- | :--- | :--- |
| Balance at January 1 | $86 | $70 |
| Additions based on tax positions related to the current year | 2 | 5 |
| Additions for tax positions of prior years | 5 | 12 |
| Reductions for tax positions of prior years | (11) | (11) |
| Settlements | (10) | (4) |
| Lapse of statute of limitations | (3) | (1) |
| Acquisitions | 6 | 21 |
| Foreign currency translation | 2 | (6) |
| Balance at December 31 | $77 | $86 |

as of december 31 , 2009 , $ 61 million of unrecognized tax benefits would impact the effective tax rate if recognized . aon does not expect the unrecognized tax positions to change significantly over the next twelve months . the company recognizes penalties and interest related to unrecognized income tax benefits in its provision for income taxes . aon accrued potential penalties of less than $ 1 million during each of 2009 , 2008 and 2007 . aon accrued interest of $ 2 million during 2009 and less than $ 1 million during both 2008 and 2007 . as of december 31 , 2009 and 2008 , aon has recorded a liability for penalties of $ 5 million and $ 4 million , respectively , and for interest of $ 18 million and $ 14 million , respectively . aon and its subsidiaries file income tax returns in the u.s . federal jurisdiction as well as various state and international jurisdictions . aon has substantially concluded all u.s . federal income tax matters for years through 2006 . material u.s . state and local income tax jurisdiction examinations have been concluded for years through 2002 . aon has concluded income tax examinations in its primary international jurisdictions through 2002. .

foreign_currency_translation_2009 = 2
foreign_currency_translation_2008 = -6
difference = foreign_currency_translation_2009 - foreign_currency_translation_2008
answer = difference