Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details)

v3.21.1
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 34,208 $ 33,327
Not Designated as Hedging Instrument, Economic Hedge    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 9,271 6,271
Fair Value Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 8,587 9,681
Cash Flow Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 16,350 17,375
Loans Payable [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 17,621 18,646
Loans Payable [Member] | Not Designated as Hedging Instrument, Economic Hedge    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 1,271 1,271
Loans Payable [Member] | Fair Value Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0 0
Loans Payable [Member] | Cash Flow Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 16,350 17,375
Securities Investment [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 3,190 3,484
Securities Investment [Member] | Not Designated as Hedging Instrument, Economic Hedge    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0 0
Securities Investment [Member] | Fair Value Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 3,190 3,484
Securities Investment [Member] | Cash Flow Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 0 0
Other long-term debt    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 13,397 11,197
Other long-term debt | Not Designated as Hedging Instrument, Economic Hedge    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 8,000 5,000
Other long-term debt | Fair Value Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount 5,397 6,197
Other long-term debt | Cash Flow Hedging | Designated as Hedging Instrument [Member]    
Notional Disclosures [Abstract]    
Derivative, Notional Amount $ 0 $ 0