DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Notional Amount	$ 308,175	$ 303,721
Derivative Assets
Derivative assets	1,692	1,532
Less: Gross amounts offset in the Consolidated Balance Sheets	(498)	(342)
Less: Cash collateral applied	(389)	(494)
Total net derivatives presented in the Consolidated Balance Sheets	805	696
Derivative Liabilities
Derivative liabilities	1,519	1,258
Less: Gross amounts offset in the Consolidated Balance Sheets	(498)	(342)
Less: Cash collateral applied	(207)	(137)
Total net derivatives presented in the Consolidated Balance Sheets	814	779
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	242,599	236,363
Derivative Assets
Derivative assets	1,418	1,166
Derivative Liabilities
Derivative liabilities	1,507	1,233
Interest rate contracts
Derivative Assets
Derivative assets	411	553
Derivative Liabilities
Derivative liabilities	468	471
Interest rate contracts | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	65,576	67,358
Derivative Assets
Derivative assets	274	366
Derivative Liabilities
Derivative liabilities	12	25
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	183,611	180,977
Derivative Assets
Derivative assets	137	187
Derivative Liabilities
Derivative liabilities	456	446
Foreign exchange contracts
Derivative Assets
Derivative assets	528	510
Derivative Liabilities
Derivative liabilities	366	373
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	36,697	40,401
Derivative Assets
Derivative assets	528	510
Derivative Liabilities
Derivative liabilities	366	373
Commodities contracts
Derivative Assets
Derivative assets	717	458
Derivative Liabilities
Derivative liabilities	661	405
Commodities contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	14,085	10,974
Derivative Assets
Derivative assets	717	458
Derivative Liabilities
Derivative liabilities	661	405
TBA contracts
Derivative Assets
Derivative assets	29	2
Derivative Liabilities
Derivative liabilities	20	6
TBA contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	7,147	3,043
Derivative Assets
Derivative assets	29	2
Derivative Liabilities
Derivative liabilities	20	6
Other contracts
Derivative Assets
Derivative assets	7	9
Derivative Liabilities
Derivative liabilities	4	3
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	1,059	968
Derivative Assets
Derivative assets	7	9
Derivative Liabilities
Derivative liabilities	$ 4	$ 3