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Pledged Assets (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged $ 41,900,000,000   $ 41,900,000,000   $ 40,100,000,000
Securities eligible to be repledged or sold 987,800,000   987,800,000   833,400,000
Fair value of accepted collateral 517,800,000   517,800,000   78,300,000
Amount of securities re pledged or sold collateral 0   0   0
Average deposits maintained to meet Federal Reserve Bank reserve requirements 1,700,000,000 $ 1,800,000,000 1,800,000,000 $ 2,100,000,000  
US Government Agencies Debt Securities And Other Securities          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 32,600,000,000   32,600,000,000   30,800,000,000
Obligations of States and Political Subdivisions          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 722,100,000   722,100,000   684,300,000
Loans          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 8,600,000,000   8,600,000,000   8,600,000,000
Collateral Requirements          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 11,100,000,000   11,100,000,000   8,900,000,000
Available for Sale Debt Securities          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 984,400,000   984,400,000   833,400,000
Repurchase Agreements          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 41,200,000   41,200,000   39,900,000
Fair value of accepted collateral 900,000,000   900,000,000   1,200,000,000
Derivative contract          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Fair value of accepted collateral 162,700,000   162,700,000   4,600,000
Amount of securities re pledged or sold collateral $ 0   $ 0   $ 0