DERIVATIVES - Derivative Notionals (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivatives
Reduction in derivative receivables	$ (403,000)	$ (444,987)
Hedging instruments under ASC 815
Derivatives
Derivative notionals	347,586	349,195
Reduction in derivative receivables	(2,161)	(2,888)
Hedging instruments under ASC 815 | Interest rate contracts
Derivatives
Derivative notionals	256,131	255,280
Reduction in derivative receivables	(540)	(597)
Hedging instruments under ASC 815 | Interest rate swaps
Derivatives
Derivative notionals	256,131	255,280
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	89,869	92,344
Reduction in derivative receivables	(1,621)	(2,291)
Hedging instruments under ASC 815 | Foreign exchange swaps
Derivatives
Derivative notionals	42,117	48,678
Hedging instruments under ASC 815 | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	47,752	43,666
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	1,586	1,571
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	1,586	1,571
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	51,877,545	45,032,245
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	35,484,373	30,565,052
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	26,965,401	23,780,711
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	3,494,099	2,966,025
Other derivative instruments, Trading derivatives | Interest rate contract options | Written
Derivatives
Derivative notionals	2,598,919	1,937,025
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	2,425,954	1,881,291
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	13,151,552	11,669,079
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	7,613,604	6,746,070
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	3,869,688	3,350,341
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written
Derivatives
Derivative notionals	838,598	789,077
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	829,662	783,591
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	1,363,998	1,213,082
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	273,483	266,115
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	87,637	76,935
Other derivative instruments, Trading derivatives | Equity contract options | Written
Derivatives
Derivative notionals	558,215	482,266
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	444,663	387,766
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	362,430	350,257
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	82,002	90,884
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	177,615	165,314
Other derivative instruments, Trading derivatives | Commodity and other contracts | Written
Derivatives
Derivative notionals	50,931	45,862
Other derivative instruments, Trading derivatives | Commodity and other contracts | Purchased
Derivatives
Derivative notionals	51,882	48,197
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	1,515,192	1,234,775
Other derivative instruments, Trading derivatives | Credit derivatives | Written
Derivatives
Derivative notionals	725,634	593,136
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 789,558	$ 641,639