Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details)

v3.8.0.1
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 9,700,000,000 $ 10,800,000,000
Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 8,375,000,000 7,475,000,000
Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 1,325,000,000 3,325,000,000
Loan    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 1,325,000,000 3,325,000,000
Loan | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0 0
Loan | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 1,325,000,000 3,325,000,000
Subordinated notes    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 950,000,000 950,000,000
Subordinated notes | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 950,000,000 950,000,000
Subordinated notes | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0 0
Other long-term debt    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 7,425,000,000 6,525,000,000
Other long-term debt | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 7,425,000,000 6,525,000,000
Other long-term debt | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 0 $ 0