Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details)

v3.20.2
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Credit Derivatives [Line Items]    
Document Period End Date Jun. 30, 2020  
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 28,819 $ 25,927
Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 10,444 7,540
Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 18,375 18,387
Loans Payable [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 18,375 18,375
Loans Payable [Member] | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0  
Loans Payable [Member] | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 18,375 18,375
Securities Investment [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 2,950 12
Securities Investment [Member] | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 2,950 0
Securities Investment [Member] | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0 12
Other long-term debt    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 7,494 7,540
Other long-term debt | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 7,494 7,540
Other long-term debt | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 0 $ 0