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Details of Certain Consolidated Statements of Income Lines (Details 2) (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 marketing, promotion, rewards and cardmember services $ 2,330 $ 2,292
Marketing and promotion [Member]
   
Component of Operating Other Cost and Expense [Line Items]    
Total marketing, promotion, rewards and cardmember services 621 631
Cardmember rewards [Member]
   
Component of Operating Other Cost and Expense [Line Items]    
Total marketing, promotion, rewards and cardmember services 1,520 1,467
Cardmember services [Member]
   
Component of Operating Other Cost and Expense [Line Items]    
Total marketing, promotion, rewards and cardmember services $ 189 $ 194