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Securities - Certain Corporate and Strategic Investments (Details) (USD $)
Share data in Billions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
First Data Corporation [Member]
   
Equity Method Investments and Joint Ventures [Abstract]    
Equity Method Investment, Ownership Percentage 49.00%  
Equity Method Investments $ 3,300,000,000 $ 3,300,000,000
Common Stock [Member] | China Construction Bank [Member]
   
Cost Method Investments [Abstract]    
Investment Owned, Balance, Shares 2.0 2.0
Cost method investment ownership percentage 1.00% 1.00%
Cost Method Investment, Cost Basis 716,000,000  
Cost-method Investments, Aggregate Carrying Amount $ 1,500,000,000 $ 1,400,000,000