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Details of Certain Consolidated Statements of Income Lines (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Component of Operating Other Cost and Expense [Line Items]    
Total other, net expense $ 1,530 $ 1,475
Professional services [Member]
    
Component of Operating Other Cost and Expense [Line Items]    
Total other, net expense 716 691
Occupancy and equipment [Member]
    
Component of Operating Other Cost and Expense [Line Items]    
Total other, net expense 472 438
Communications [Member]
    
Component of Operating Other Cost and Expense [Line Items]    
Total other, net expense 96 96
Other net expenses [Member]
    
Component of Operating Other Cost and Expense [Line Items]    
Total other, net expense $ 246 $ 250