DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Notional Amount	$ 325,780	$ 250,495
Derivative Assets
Derivative assets	1,698	1,839
Less: Gross amounts offset in the Consolidated Balance Sheets	(609)	(623)
Less: Cash collateral applied	(567)	(374)
Total net derivatives presented in the Consolidated Balance Sheets	522	842
Derivative Liabilities
Derivative liabilities	2,948	3,111
Less: Gross amounts offset in the Consolidated Balance Sheets	(609)	(623)
Less: Cash collateral applied	(230)	(579)
Total net derivatives presented in the Consolidated Balance Sheets	2,109	1,909
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	236,278	208,245
Derivative Assets
Derivative assets	1,519	1,823
Derivative Liabilities
Derivative liabilities	2,891	3,058
Interest rate contracts
Derivative Assets
Derivative assets	439	347
Derivative Liabilities
Derivative liabilities	1,842	1,632
Interest rate contracts | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	89,502	42,250
Derivative Assets
Derivative assets	179	16
Derivative Liabilities
Derivative liabilities	57	53
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	200,389	174,384
Derivative Assets
Derivative assets	260	331
Derivative Liabilities
Derivative liabilities	1,785	1,579
Foreign exchange contracts
Derivative Assets
Derivative assets	530	527
Derivative Liabilities
Derivative liabilities	432	519
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	30,168	29,475
Derivative Assets
Derivative assets	530	527
Derivative Liabilities
Derivative liabilities	432	519
Commodities contracts
Derivative Assets
Derivative assets	707	953
Derivative Liabilities
Derivative liabilities	666	942
Commodities contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	1,273	1,103
Derivative Assets
Derivative assets	707	953
Derivative Liabilities
Derivative liabilities	666	942
TBA contracts
Derivative Assets
Derivative assets	17	7
Derivative Liabilities
Derivative liabilities	5	14
TBA contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	3,561	2,370
Derivative Assets
Derivative assets	17	7
Derivative Liabilities
Derivative liabilities	5	14
Other contracts
Derivative Assets
Derivative assets	5	5
Derivative Liabilities
Derivative liabilities	3	4
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	887	913
Derivative Assets
Derivative assets	5	5
Derivative Liabilities
Derivative liabilities	$ 3	$ 4