Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details)

v3.20.1
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 27,415 $ 25,927
Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 8,040 7,540
Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 19,375 18,387
Loans Payable [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 19,375 18,375
Loans Payable [Member] | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0 0
Loans Payable [Member] | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 19,375 18,375
Securities Investment [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount   12
Securities Investment [Member] | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount   0
Securities Investment [Member] | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount   12
Other long-term debt    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 8,040 7,540
Other long-term debt | Fair Value Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 8,040 7,540
Other long-term debt | Cash Flow Hedging    
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 0 $ 0