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Pledged Assets (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged $ 35,500,000,000   $ 35,800,000,000
Fair value of accepted collateral 1,600,000,000   1,500,000,000
Amount of securities repledged or sold collateral 0   0
Average deposits maintained to meet Federal Reserve Bank reserve requirements 1,800,000,000 $ 1,500,000,000  
US Government Agencies Debt Securities And Other Securities      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 26,800,000,000   27,100,000,000
Obligations of States and Political Subdivisions      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 211,000,000   117,500,000
Loans      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 8,500,000,000   8,600,000,000
Collateral Requirements      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 6,900,000,000   8,900,000,000
Securities Available for Sale      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged $ 1,405,700,000   $ 1,545,600,000