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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Millions
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Consolidated Statements of Cash Flows [Abstract]    
Sale of premises and equipment $ 3 $ 7
Net Cash Provided by (Used in) Discontinued Operations [Abstract]    
Cash and cash equivalents at beginning of period 16,356 16,599
Cash and cash equivalents at end of period 23,082 20,687
Segment Discontinued Operations [Member]
   
Net Cash Provided by (Used in) Discontinued Operations [Abstract]    
Cash and cash equivalents at end of period $ 0 $ 0