DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Hedging instruments under ASC 815
Derivatives
Derivative notionals	$ 380,277	$ 374,383
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	288,367	277,003
Hedging instruments under ASC 815 | Interest rate swaps
Derivatives
Derivative notionals	288,367	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
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	88,483	95,630
Hedging instruments under ASC 815 | Foreign exchange swaps
Derivatives
Derivative notionals	38,142	45,851
Hedging instruments under ASC 815 | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	50,341	49,779
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	3,427	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	3,427	1,750
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	46,812,271	41,538,477
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	27,670,668	25,541,413
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	18,656,456	17,077,712
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	3,471,800	3,022,127
Other derivative instruments, Trading derivatives | Interest rate contract options | Written
Derivatives
Derivative notionals	2,903,068	2,753,912
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	2,639,344	2,687,662
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	16,144,335	13,229,648
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	8,609,176	7,943,054
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	5,203,348	3,737,063
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written
Derivatives
Derivative notionals	1,168,997	778,397
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	1,162,814	771,134
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	1,488,215	1,362,973
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	334,497	317,117
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	74,762	72,592
Other derivative instruments, Trading derivatives | Equity contract options | Written
Derivatives
Derivative notionals	608,335	544,315
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	470,621	428,949
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	394,433	340,117
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	79,070	82,009
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	178,223	161,811
Other derivative instruments, Trading derivatives | Commodity and other contracts | Written
Derivatives
Derivative notionals	66,528	49,555
Other derivative instruments, Trading derivatives | Commodity and other contracts | Purchased
Derivatives
Derivative notionals	70,612	46,742
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	1,114,620	1,064,326
Other derivative instruments, Trading derivatives | Credit derivatives | Written
Derivatives
Derivative notionals	514,599	496,699
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 600,021	$ 567,627