Quarterly report pursuant to Section 13 or 15(d)

Securities - Certain Corporate and Strategic Investments (Details)

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Securities - Certain Corporate and Strategic Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Commitment payment period 5 years    
Tax credits and other tax benefits from investments $ 193 $ 217  
Percentage of income tax benefit recognized for the year (less than) 25.00%    
Other income      
Schedule of Equity Method Investments [Line Items]      
Income (loss) from affordable housing projects $ (198) $ (180)  
Other assets      
Schedule of Equity Method Investments [Line Items]      
Affordable housing tax credit investments 7,000   $ 7,100
Accrued expenses and other liabilities      
Schedule of Equity Method Investments [Line Items]      
Unfunded commitments to provide capital contributions $ 2,300   $ 2,400
Merchant Servicing Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Equity method investment ownership percentage 49.00%   49.00%
Equity method investments $ 3,000   $ 3,000