XML 191 R167.htm IDEA: XBRL DOCUMENT v3.10.0.1
Pledged and Restricted Assets - Narrative (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged $ 39,600,000,000 $ 40,100,000,000
Financial instruments owned and pledged as collateral, amount eligible to be repledged by counterparty 151,500,000 833,400,000
Fair value of accepted collateral 426,200,000 78,300,000
Amount of securities repledged or sold collateral 0 0
Average deposits maintained to meet Federal Reserve Bank reserve requirements 1,700,000,000 3,100,000,000
Us Government Agencies Debt Securities And Other Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged 30,900,000,000 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 640,400,000 684,300,000
Loans    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged 8,100,000,000 8,600,000,000
Collateral Requirements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged 9,300,000,000 8,900,000,000
Securities Available for Sale    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged 151,500,000 833,400,000
Repurchase Agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged 29,000,000 39,900,000
Fair value of accepted collateral 605,000,000 1,200,000,000
Derivative    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Fair value of accepted collateral $ 15,300,000 $ 4,600,000