DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Assets
Total derivative assets	$ 1,509	$ 2,153
Less: Gross amounts offset in the Consolidated Balance Sheets	(235)	(182)
Less: Cash collateral applied	(58)	(56)
Total net derivative fair values presented in the Consolidated Balance Sheets	1,216	1,915
Derivative Liabilities
Derivative Liabilities	922	634
Less: Gross amounts offset in the Consolidated Balance Sheets	(235)	(182)
Less: Cash collateral applied	(490)	(324)
Total net derivative fair values presented in the Consolidated Balance Sheets	197	128
Derivatives not designated as hedging instruments:
Derivative Assets
Total derivative assets	1,497	2,152
Derivative Liabilities
Derivative Liabilities	920	631
Interest rate contracts
Derivative Assets
Total derivative assets	692	1,566
Derivative Liabilities
Derivative Liabilities	176	217
Interest rate contracts | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	23,450	22,300
Derivative Assets
Total derivative assets	12	1
Derivative Liabilities
Derivative Liabilities	2	3
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	142,987	149,021
Derivative Assets
Total derivative assets	680	1,565
Derivative Liabilities
Derivative Liabilities	174	214
Commodities contracts
Derivative Assets
Total derivative assets	508	62
Derivative Liabilities
Derivative Liabilities	505	61
Commodities contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	514	246
Derivative Assets
Total derivative assets	508	62
Derivative Liabilities
Derivative Liabilities	505	61
Foreign exchange contracts
Derivative Assets
Total derivative assets	263	320
Derivative Liabilities
Derivative Liabilities	231	291
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	21,336	16,789
Derivative Assets
Total derivative assets	263	320
Derivative Liabilities
Derivative Liabilities	231	291
TBA contracts
Derivative Assets
Total derivative assets	8	8
Derivative Liabilities
Derivative Liabilities	8	65
TBA contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	7,776	11,149
Derivative Assets
Total derivative assets	8	8
Derivative Liabilities
Derivative Liabilities	8	65
Other contracts
Derivative Assets
Total derivative assets	38	197
Derivative Liabilities
Derivative Liabilities	2
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	3,555	8,051
Derivative Assets
Total derivative assets	38	197
Derivative Liabilities
Derivative Liabilities	$ 2	$ 0