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Reportable Operating Segments and Geographic Operations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Non-interest revenues $ 6,862 $ 6,638
Interest income 1,776 1,762
Interest expense 439 519
Total revenues, net of interest expense 8,199 7,881
Net income 1,432 1,280
U S Card Services [Member]
    
Segment Reporting Information [Line Items]    
Non-interest revenues 3,017 2,878
Interest income 1,423 1,386
Interest expense 150 182
Total revenues, net of interest expense 4,290 4,082
Net income 876 804
International Card Services [Member]
    
Segment Reporting Information [Line Items]    
Non-interest revenues 1,157 1,124
Interest income 277 290
Interest expense 82 97
Total revenues, net of interest expense 1,352 1,317
Net income 159 178
Global Commercial Services [Member]
    
Segment Reporting Information [Line Items]    
Non-interest revenues 1,249 1,220
Interest income 4 3
Interest expense 59 60
Total revenues, net of interest expense 1,194 1,163
Net income 184 191
Global Network And Merchant Services [Member]
    
Segment Reporting Information [Line Items]    
Non-interest revenues 1,293 1,234
Interest income 10 7
Interest expense (62) (62)
Total revenues, net of interest expense 1,365 1,303
Net income 443 373
Corporate and Other [Member]
    
Segment Reporting Information [Line Items]    
Non-interest revenues 146 182
Interest income 62 76
Interest expense 210 242
Total revenues, net of interest expense (2) 16
Net income $ (230) $ (266)