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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2012
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits
 At
 March 31, December 31,
(In millions)2012 2011
      
Unrecognized tax benefits$ 5,229 $ 5,230
      Portion that, if recognized, would reduce tax expense and effective tax rate(a)  3,957   3,938
Accrued interest on unrecognized tax benefits  1,023   1,033
Accrued penalties on unrecognized tax benefits  134   121
Reasonably possible reduction to the balance of unrecognized tax benefits     
   in succeeding 12 months 0-850  0-900
      Portion that, if recognized, would reduce tax expense and effective tax rate(a) 0-450  0-500
      
      

(a)       Some portion of such reduction may be reported as discontinued operations.