DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivatives
Reduction in derivative receivables	$ (462,703)	$ (386,851)
Hedging instruments under ASC 815
Derivatives
Derivative notionals	409,118	367,355
Reduction in derivative receivables	(2,527)	(2,633)
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	318,974	267,035
Reduction in derivative receivables	(797)	(1,289)
Hedging instruments under ASC 815 | Interest rate swaps
Derivatives
Derivative notionals	318,974	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
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	88,779	98,224
Reduction in derivative receivables	(1,730)	(1,344)
Hedging instruments under ASC 815 | Foreign exchange swaps
Derivatives
Derivative notionals	45,428	47,298
Hedging instruments under ASC 815 | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	43,351	50,926
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	1,365	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	1,365	2,096
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	44,358,096	41,989,120
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	29,769,325	27,270,067
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	23,331,571	21,873,538
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	2,714,997	2,383,702
Other derivative instruments, Trading derivatives | Interest rate contract options | Written
Derivatives
Derivative notionals	1,879,285	1,584,451
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	1,843,472	1,428,376
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	11,632,496	11,921,335
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	6,276,146	6,288,193
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	3,668,569	4,316,242
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written
Derivatives
Derivative notionals	846,794	664,942
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	840,987	651,958
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	1,198,655	1,230,987
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	243,070	269,062
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	73,495	71,363
Other derivative instruments, Trading derivatives | Equity contract options | Written
Derivatives
Derivative notionals	485,109	492,433
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	396,981	398,129
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	437,097	348,249
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	110,833	91,962
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	201,926	157,195
Other derivative instruments, Trading derivatives | Commodity and other contracts | Written
Derivatives
Derivative notionals	63,643	51,224
Other derivative instruments, Trading derivatives | Commodity and other contracts | Purchased
Derivatives
Derivative notionals	60,695	47,868
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	1,320,523	1,218,482
Other derivative instruments, Trading derivatives | Credit derivatives | Written
Derivatives
Derivative notionals	638,379	572,486
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 682,144	$ 645,996