Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Managemen Add Info (Details Add Info)

v3.4.0.3
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Managemen Add Info (Details Add Info) - USD ($)
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Derivative, Notional Amount $ 12,375,000,000 $ 500,000,000
Additional information about the interest rate swaps used in companies Asset and Liability Management    
Notional Amount Of Interest Rate Derivatives $ 12,375,000,000  
Average Maturity (years) 2 years  
Fair Value $ 152,680,000  
Weighted-Average Rate Receive 1.24%  
Weighted-Average Rate Pay 0.60%  
Asset conversion swaps - Receive Fixed - Generic    
Additional information about the interest rate swaps used in companies Asset and Liability Management    
Notional Amount Of Interest Rate Derivatives $ 5,550,000,000  
Average Maturity (years) 10 months 24 days  
Fair Value $ 10,925,000  
Weighted-Average Rate Receive 0.91%  
Weighted-Average Rate Pay 0.57%  
Liability conversion swaps - Receive Fixed - Generic    
Additional information about the interest rate swaps used in companies Asset and Liability Management    
Notional Amount Of Interest Rate Derivatives $ 6,825,000,000  
Average Maturity (years) 2 years 9 months 18 days  
Fair Value $ 141,755,000  
Weighted-Average Rate Receive 1.50%  
Weighted-Average Rate Pay 0.63%  
Fair Value Hedging    
Derivative [Line Items]    
Derivative, Notional Amount $ 6,825,000,000  
Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 5,550,000,000  
Loan    
Derivative [Line Items]    
Derivative, Notional Amount 5,550,000,000  
Loan | Fair Value Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 0  
Loan | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 5,550,000,000  
Deposits    
Derivative [Line Items]    
Derivative, Notional Amount 0  
Deposits | Fair Value Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 0  
Deposits | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 0  
Subordinated notes    
Derivative [Line Items]    
Derivative, Notional Amount 450,000,000  
Subordinated notes | Fair Value Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 450,000,000  
Subordinated notes | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 0  
Other long term debt    
Derivative [Line Items]    
Derivative, Notional Amount 6,375,000,000  
Other long term debt | Fair Value Hedging    
Derivative [Line Items]    
Derivative, Notional Amount 6,375,000,000  
Other long term debt | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Notional Amount $ 0