exchanged installment notes totaling approximately $ 4.8 billion and approximately $ 400 million of inter- national paper promissory notes for interests in enti- ties formed to monetize the notes . international paper determined that it was not the primary benefi- ciary of these entities , and therefore should not consolidate its investments in these entities . during 2006 , these entities acquired an additional $ 4.8 bil- lion of international paper debt securities for cash , resulting in a total of approximately $ 5.2 billion of international paper debt obligations held by these entities at december 31 , 2006 . since international paper has , and intends to affect , a legal right to offset its obligations under these debt instruments with its investments in the entities , international paper has offset $ 5.0 billion of interest in the entities against $ 5.0 billion of international paper debt obligations held by the entities as of december 31 , 2007 . international paper also holds variable interests in two financing entities that were used to monetize long-term notes received from sales of forestlands in 2002 and 2001 . see note 8 of the notes to consolidated financial statements in item 8 . financial statements and supplementary data for a further discussion of these transactions . capital resources outlook for 2008 international paper expects to be able to meet pro- jected capital expenditures , service existing debt and meet working capital and dividend requirements during 2008 through current cash balances and cash from operations , supplemented as required by its various existing credit facilities . international paper has approximately $ 2.5 billion of committed bank credit agreements , which management believes is adequate to cover expected operating cash flow variability during our industry 2019s economic cycles . the agreements generally provide for interest rates at a floating rate index plus a pre-determined margin dependent upon international paper 2019s credit rating . the agreements include a $ 1.5 billion fully commit- ted revolving bank credit agreement that expires in march 2011 and has a facility fee of 0.10% ( 0.10 % ) payable quarterly . these agreements also include up to $ 1.0 billion of available commercial paper-based financ- ings under a receivables securitization program that expires in october 2009 with a facility fee of 0.10% ( 0.10 % ) . at december 31 , 2007 , there were no borrowings under either the bank credit agreements or receiv- ables securitization program . the company will continue to rely upon debt and capital markets for the majority of any necessary long-term funding not provided by operating cash flows . funding decisions will be guided by our capi- tal structure planning objectives . the primary goals of the company 2019s capital structure planning are to maximize financial flexibility and preserve liquidity while reducing interest expense . the majority of international paper 2019s debt is accessed through global public capital markets where we have a wide base of investors . the company was in compliance with all its debt covenants at december 31 , 2007 . principal financial covenants include maintenance of a minimum net worth , defined as the sum of common stock , paid-in capital and retained earnings , less treasury stock , plus any goodwill impairment charges , of $ 9 billion ; and a maximum total debt to capital ratio , defined as total debt divided by total debt plus net worth , of 60% ( 60 % ) . maintaining an investment grade credit rating is an important element of international paper 2019s financing strategy . at december 31 , 2007 , the company held long-term credit ratings of bbb ( stable outlook ) and baa3 ( stable outlook ) by standard & poor 2019s ( s&p ) and moody 2019s investor services ( moody 2019s ) , respectively . the company currently has short-term credit ratings by s&p and moody 2019s of a-2 and p-3 , respectively . contractual obligations for future payments under existing debt and lease commitments and purchase obligations at december 31 , 2007 , were as follows : in millions 2008 2009 2010 2011 2012 thereafter maturities of long-term debt ( a ) $ 267 $ 1300 $ 1069 $ 396 $ 532 $ 3056 debt obligations with right of offset ( b ) 2013 2013 2013 2013 2013 5000 .

Table:
in millions | 2008 | 2009 | 2010 | 2011 | 2012 | thereafter
maturities of long-term debt ( a ) | $ 267 | $ 1300 | $ 1069 | $ 396 | $ 532 | $ 3056
debt obligations with right of offset ( b ) | 2013 | 2013 | 2013 | 2013 | 2013 | 5000
lease obligations | 136 | 116 | 101 | 84 | 67 | 92
purchase obligations ( c ) | 1953 | 294 | 261 | 235 | 212 | 1480
total ( d ) | $ 2356 | $ 1710 | $ 1431 | $ 715 | $ 811 | $ 9628
( a ) total debt includes scheduled principal payments only .
( b ) represents debt obligations borrowed from non-consolidated variable interest entities for which international paper has , and intends to affect , a legal right to offset these obligations with investments held in the entities .
accordingly , in its con- solidated balance sheet at december 31 , 2007 , international paper has offset approximately $ 5.0 billion of interests in the entities against this $ 5.0 billion of debt obligations held by the entities ( see note 8 in the accompanying consolidated financial statements ) .
( c ) includes $ 2.1 billion relating to fiber supply agreements entered into at the time of the transformation plan forestland sales .
( d ) not included in the above table are unrecognized tax benefits of approximately $ 280 million. .

Question: during 2006 what was the initial debt balance prior to the issuance of additional international paper debt securities for cash
Answer: 0.4
Calculation: subtract(5.2, 4.8)