DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative Assets
Derivative assets	$ 2,163	$ 1,509
Less: Gross amounts offset in the Consolidated Balance Sheets	(312)	(235)
Less: Cash collateral applied	(176)	(58)
Total net derivative fair values presented in the Consolidated Balance Sheets	1,675	1,216
Derivative Liabilities
Derivative liabilities	2,343	922
Less: Gross amounts offset in the Consolidated Balance Sheets	(312)	(235)
Less: Cash collateral applied	(1,396)	(490)
Total net derivative fair values presented in the Consolidated Balance Sheets	635	197
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative assets	2,162	1,497
Derivative Liabilities
Derivative liabilities	2,342	920
Interest rate contracts
Derivative Assets
Derivative assets	173	692
Derivative Liabilities
Derivative liabilities	446	176
Interest rate contracts | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	17,250	23,450
Derivative Assets
Derivative assets	1	12
Derivative Liabilities
Derivative liabilities	1	2
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	158,286	142,987
Derivative Assets
Derivative assets	172	680
Derivative Liabilities
Derivative liabilities	445	174
Foreign exchange contracts
Derivative Assets
Derivative assets	378	263
Derivative Liabilities
Derivative liabilities	349	231
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	22,809	21,336
Derivative Assets
Derivative assets	378	263
Derivative Liabilities
Derivative liabilities	349	231
Commodities contracts
Derivative Assets
Derivative assets	1,501	508
Derivative Liabilities
Derivative liabilities	1,496	505
Commodities contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	694	514
Derivative Assets
Derivative assets	1,501	508
Derivative Liabilities
Derivative liabilities	1,496	505
TBA contracts
Derivative Assets
Derivative assets	102	8
Derivative Liabilities
Derivative liabilities	22	8
TBA contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	7,650	7,776
Derivative Assets
Derivative assets	102	8
Derivative Liabilities
Derivative liabilities	22	8
Other contracts
Derivative Assets
Derivative assets	9	38
Derivative Liabilities
Derivative liabilities	30	2
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	3,081	3,555
Derivative Assets
Derivative assets	9	38
Derivative Liabilities
Derivative liabilities	$ 30	$ 2