DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Hedging instruments under ASC 815
Derivatives
Derivative notionals	$ 470,978	$ 373,434
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	358,870	276,939
Hedging instruments under ASC 815 | Interest rate swaps
Derivatives
Derivative notionals	358,870	276,939
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
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	92,851	92,092
Hedging instruments under ASC 815 | Foreign exchange swaps
Derivatives
Derivative notionals	36,361	36,421
Hedging instruments under ASC 815 | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	56,490	55,671
Hedging instruments under ASC 815 | Foreign exchange contract options | Written
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
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	19,257	4,403
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	19,257	4,403
Hedging instruments under ASC 815 | Commodity and other contracts | Written
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 | Commodity and other contracts | 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
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	47,708,108	39,824,952
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	28,335,744	23,577,823
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	19,205,497	15,245,212
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	3,620,561	3,006,869
Other derivative instruments, Trading derivatives | Interest rate contract options | Written
Derivatives
Derivative notionals	2,854,320	2,799,577
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	2,655,366	2,526,165
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	16,027,224	13,486,437
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	8,218,569	7,422,309
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	5,437,700	4,028,135
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written
Derivatives
Derivative notionals	1,183,154	1,022,109
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	1,187,801	1,013,884
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	1,813,680	1,415,549
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	329,883	323,751
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	74,426	73,437
Other derivative instruments, Trading derivatives | Equity contract options | Written
Derivatives
Derivative notionals	783,385	581,659
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	625,986	436,702
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	371,385	374,568
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	80,760	80,582
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	160,185	183,494
Other derivative instruments, Trading derivatives | Commodity and other contracts | Written
Derivatives
Derivative notionals	64,279	54,673
Other derivative instruments, Trading derivatives | Commodity and other contracts | Purchased
Derivatives
Derivative notionals	66,161	55,819
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	1,160,075	970,575
Other derivative instruments, Trading derivatives | Credit derivatives | Written
Derivatives
Derivative notionals	533,380	439,146
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 626,695	$ 531,429