DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Hedging instruments under ASC 815
Derivatives
Derivative notionals	$ 500,734	$ 373,434
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	388,000	276,939
Hedging instruments under ASC 815 | Interest rate swaps
Derivatives
Derivative notionals	388,000	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	100,749	92,092
Hedging instruments under ASC 815 | Foreign exchange swaps
Derivatives
Derivative notionals	40,421	36,421
Hedging instruments under ASC 815 | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	60,328	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	11,985	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	11,985	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	51,560,160	39,824,952
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	30,481,246	23,577,823
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	20,066,734	15,245,212
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	4,128,658	3,006,869
Other derivative instruments, Trading derivatives | Interest rate contract options | Written
Derivatives
Derivative notionals	3,301,018	2,799,577
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	2,984,836	2,526,165
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	17,306,304	13,486,437
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	9,439,666	7,422,309
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	5,805,127	4,028,135
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written
Derivatives
Derivative notionals	1,054,305	1,022,109
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	1,007,206	1,013,884
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	2,103,792	1,415,549
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	438,187	323,751
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	92,003	73,437
Other derivative instruments, Trading derivatives | Equity contract options | Written
Derivatives
Derivative notionals	864,311	581,659
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	709,291	436,702
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	446,714	374,568
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	82,251	80,582
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	208,178	183,494
Other derivative instruments, Trading derivatives | Commodity and other contracts | Written
Derivatives
Derivative notionals	77,355	54,673
Other derivative instruments, Trading derivatives | Commodity and other contracts | Purchased
Derivatives
Derivative notionals	78,930	55,819
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	1,222,104	970,575
Other derivative instruments, Trading derivatives | Credit derivatives | Written
Derivatives
Derivative notionals	553,561	439,146
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 668,543	$ 531,429