DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative assets, location	Trading account assets	Trading account assets
Derivative liabilities, location	Trading account liabilities	Trading account liabilities
Hedging instruments under ASC 815
Derivatives
Derivative notionals	$ 349,195	$ 367,355
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	255,280	267,035
Hedging instruments under ASC 815 | Interest rate swaps
Derivatives
Derivative notionals	255,280	267,035
Hedging instruments under ASC 815 | Interest rate futures and forwards
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Interest rate contract options | Written or Protection Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Interest rate contract options | Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Foreign exchange contracts
Derivatives
Derivative notionals	92,344	98,224
Hedging instruments under ASC 815 | Foreign exchange swaps
Derivatives
Derivative notionals	48,678	47,298
Hedging instruments under ASC 815 | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	43,666	50,926
Hedging instruments under ASC 815 | Foreign exchange contract options | Written or Protection Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Equity contracts
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Equity swaps
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Equity futures and forwards
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Equity contract options | Written or Protection Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Equity contract options | Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Commodity and other contracts
Derivatives
Derivative notionals	1,571	2,096
Hedging instruments under ASC 815 | Commodity and other swaps
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Commodity and other futures and forwards
Derivatives
Derivative notionals	1,571	2,096
Hedging instruments under ASC 815 | Commodity and other contract options | Written or Protection Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Credit derivatives
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Credit derivatives | Written or Protection Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Credit derivatives | Purchased
Derivatives
Derivative notionals	0	0
Other derivative instruments, Trading derivatives
Derivatives
Derivative notionals	45,032,245	41,989,120
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	30,565,052	27,270,067
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	23,780,711	21,873,538
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	2,966,025	2,383,702
Other derivative instruments, Trading derivatives | Interest rate contract options | Written or Protection Sold
Derivatives
Derivative notionals	1,937,025	1,584,451
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	1,881,291	1,428,376
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	11,669,079	11,921,335
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	6,746,070	6,288,193
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	3,350,341	4,316,242
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written or Protection Sold
Derivatives
Derivative notionals	789,077	664,942
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	783,591	651,958
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	1,213,082	1,230,987
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	266,115	269,062
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	76,935	71,363
Other derivative instruments, Trading derivatives | Equity contract options | Written or Protection Sold
Derivatives
Derivative notionals	482,266	492,433
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	387,766	398,129
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	350,257	348,249
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	90,884	91,962
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	165,314	157,195
Other derivative instruments, Trading derivatives | Commodity and other contract options | Written or Protection Sold
Derivatives
Derivative notionals	45,862	51,224
Other derivative instruments, Trading derivatives | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	48,197	47,868
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	1,234,775	1,218,482
Other derivative instruments, Trading derivatives | Credit derivatives | Written or Protection Sold
Derivatives
Derivative notionals	593,136	572,486
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 641,639	$ 645,996