.5 billion , $ 2.6 billion and $ 3.7 billion as of december 31 , 2009 , 2008 and 2007 , respectively , representing earnings of non-u.s . subsidiaries intended to be permanently reinvested . computation of the potential deferred tax liability associated with these undistributed earnings and other basis differences is not practicable . note 11 commitments and contingent liabilities certain property , machinery and equipment are leased under cancelable and non-cancelable agree- ments