DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
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	$ 373,434	$ 374,383
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	276,939	277,003
Hedging instruments under ASC 815 | Interest rate swaps
Derivatives
Derivative notionals	276,939	277,003
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 options
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	92,092	95,630
Hedging instruments under ASC 815 | Foreign exchange swaps
Derivatives
Derivative notionals	36,421	45,851
Hedging instruments under ASC 815 | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	55,671	49,779
Hedging instruments under ASC 815 | Foreign exchange contract options | Written options
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 options
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	4,403	1,750
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	4,403	1,750
Hedging instruments under ASC 815 | Commodity and other contract options | Written options
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 options
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	39,824,952	41,538,477
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	23,577,823	25,541,413
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	15,245,212	17,077,712
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	3,006,869	3,022,127
Other derivative instruments, Trading derivatives | Interest rate contract options | Written options
Derivatives
Derivative notionals	2,799,577	2,753,912
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	2,526,165	2,687,662
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	13,486,437	13,229,648
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	7,422,309	7,943,054
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	4,028,135	3,737,063
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written options
Derivatives
Derivative notionals	1,022,109	778,397
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	1,013,884	771,134
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	1,415,549	1,362,973
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	323,751	317,117
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	73,437	72,592
Other derivative instruments, Trading derivatives | Equity contract options | Written options
Derivatives
Derivative notionals	581,659	544,315
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	436,702	428,949
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	374,568	340,117
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	80,582	82,009
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	183,494	161,811
Other derivative instruments, Trading derivatives | Commodity and other contract options | Written options
Derivatives
Derivative notionals	54,673	49,555
Other derivative instruments, Trading derivatives | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	55,819	46,742
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	970,575	1,064,326
Other derivative instruments, Trading derivatives | Credit derivatives | Written options
Derivatives
Derivative notionals	439,146	496,699
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 531,429	$ 567,627