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Pledged Assets (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged $ 42,600,000,000   $ 40,300,000,000
Fair value of accepted collateral 1,600,000,000   1,800,000,000
Amount of securities re pledged or sold collateral 0   0
Average deposits maintained to meet Federal Reserve Bank reserve requirements 2,000,000,000 $ 1,800,000,000  
US Government Agencies Debt Securities And Other Securities      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 31,500,000,000   29,700,000,000
Obligations of States and Political Subdivisions      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 990,400,000   939,800,000
Loans      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 10,100,000,000   9,600,000,000
Collateral Requirements      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged 7,100,000,000   9,700,000,000
Available for Sale Investment Securities      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Amount of securities and loans pledged $ 1,300,000,000   $ 1,400,000,000