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Details of Certain Consolidated Statements of Income Lines (Details 1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Component of Other Income, Nonoperating [Line Items]    
Total other revenues $ 537 $ 553
Global Network Services Partner Revenues [Member]
    
Component of Other Income, Nonoperating [Line Items]    
Total other revenues 144 151
Net Gain (Loss) on Investment Securities [Member]
    
Component of Other Income, Nonoperating [Line Items]    
Total other revenues 36 24
Other Revenues [Member]
    
Component of Other Income, Nonoperating [Line Items]    
Total other revenues $ 357 $ 378