DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Notional Amount	$ 310,711	$ 309,553
Derivative Assets
Derivative assets	1,591	1,593
Less: Gross amounts offset in the Consolidated Balance Sheets	(480)	(471)
Less: Cash collateral applied	(642)	(682)
Total net derivatives presented in the Consolidated Balance Sheets	469	440
Derivative Liabilities
Derivative liabilities	2,276	2,183
Less: Gross amounts offset in the Consolidated Balance Sheets	(480)	(471)
Less: Cash collateral applied	(91)	(150)
Total net derivatives presented in the Consolidated Balance Sheets	1,705	1,562
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	228,132	222,658
Derivative Assets
Derivative assets	1,332	1,420
Derivative Liabilities
Derivative liabilities	2,233	2,139
Interest rate contracts
Derivative Assets
Derivative assets	481	464
Derivative Liabilities
Derivative liabilities	1,316	1,149
Interest rate contracts | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	82,579	86,895
Derivative Assets
Derivative assets	259	173
Derivative Liabilities
Derivative liabilities	43	44
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	193,442	185,993
Derivative Assets
Derivative assets	222	291
Derivative Liabilities
Derivative liabilities	1,273	1,105
Foreign exchange contracts
Derivative Assets
Derivative assets	389	434
Derivative Liabilities
Derivative liabilities	290	378
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	30,398	32,528
Derivative Assets
Derivative assets	389	434
Derivative Liabilities
Derivative liabilities	290	378
Commodities contracts
Derivative Assets
Derivative assets	711	685
Derivative Liabilities
Derivative liabilities	665	640
Commodities contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	1,062	1,251
Derivative Assets
Derivative assets	711	685
Derivative Liabilities
Derivative liabilities	665	640
TBA contracts
Derivative Assets
Derivative assets	2	3
Derivative Liabilities
Derivative liabilities	5	16
TBA contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	2,501	2,337
Derivative Assets
Derivative assets	2	3
Derivative Liabilities
Derivative liabilities	5	16
Other contracts
Derivative Assets
Derivative assets	8	7
Derivative Liabilities
Derivative liabilities	0	0
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	729	549
Derivative Assets
Derivative assets	8	7
Derivative Liabilities
Derivative liabilities	$ 0	$ 0