DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Notional Amount	$ 278,840	$ 309,553
Derivative Assets
Derivative assets	1,581	1,593
Less: Gross amounts offset in the Consolidated Balance Sheets	(405)	(471)
Less: Cash collateral applied	(590)	(682)
Total net derivatives presented in the Consolidated Balance Sheets	586	440
Derivative Liabilities
Derivative liabilities	1,543	2,183
Less: Gross amounts offset in the Consolidated Balance Sheets	(405)	(471)
Less: Cash collateral applied	(126)	(150)
Total net derivatives presented in the Consolidated Balance Sheets	1,012	1,562
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	220,695	222,658
Derivative Assets
Derivative assets	1,254	1,420
Derivative Liabilities
Derivative liabilities	1,493	2,139
Interest rate contracts
Derivative Assets
Derivative assets	665	464
Derivative Liabilities
Derivative liabilities	740	1,149
Interest rate contracts | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	58,145	86,895
Derivative Assets
Derivative assets	327	173
Derivative Liabilities
Derivative liabilities	50	44
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	183,770	185,993
Derivative Assets
Derivative assets	338	291
Derivative Liabilities
Derivative liabilities	690	1,105
Foreign exchange contracts
Derivative Assets
Derivative assets	371	434
Derivative Liabilities
Derivative liabilities	306	378
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	31,579	32,528
Derivative Assets
Derivative assets	371	434
Derivative Liabilities
Derivative liabilities	306	378
Commodities contracts
Derivative Assets
Derivative assets	536	685
Derivative Liabilities
Derivative liabilities	476	640
Commodities contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	1,136	1,251
Derivative Assets
Derivative assets	536	685
Derivative Liabilities
Derivative liabilities	476	640
TBA contracts
Derivative Assets
Derivative assets	3	3
Derivative Liabilities
Derivative liabilities	12	16
TBA contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	3,357	2,337
Derivative Assets
Derivative assets	3	3
Derivative Liabilities
Derivative liabilities	12	16
Other contracts
Derivative Assets
Derivative assets	6	7
Derivative Liabilities
Derivative liabilities	9	0
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	853	549
Derivative Assets
Derivative assets	6	7
Derivative Liabilities
Derivative liabilities	$ 9	$ 0