DERIVATIVES ACTIVITIES - Derivative Notionals (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Net Investment Hedging
Derivatives
Derivative notionals	$ 2,608	$ 3,752
Hedging instruments under ASC 815 (SFAS 133)
Derivatives
Derivative notionals	272,686	262,813
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts
Derivatives
Derivative notionals	179,366	163,348
Hedging instruments under ASC 815 (SFAS 133) | Interest rate swaps
Derivatives
Derivative notionals	179,366	163,348
Hedging instruments under ASC 815 (SFAS 133) | Interest rate futures and forwards
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contract options | Written or Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contract options | Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts
Derivatives
Derivative notionals	92,361	98,376
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange swaps
Derivatives
Derivative notionals	26,212	25,157
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	65,741	73,219
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts, spot contracts
Derivatives
Derivative notionals	830,000	849,000
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contract options | Written or Sold
Derivatives
Derivative notionals	204	0
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	204	0
Hedging instruments under ASC 815 (SFAS 133) | Equity contracts
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Equity swaps
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Equity futures and forwards
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Equity contract options | Written or Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Equity contract options | Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Commodity and other contracts
Derivatives
Derivative notionals	959	1,089
Hedging instruments under ASC 815 (SFAS 133) | Commodity and other swaps
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Commodity and other futures and forwards
Derivatives
Derivative notionals	959	1,089
Hedging instruments under ASC 815 (SFAS 133) | Commodity and other contract options | Written or Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives | Written or Sold
Derivatives
Derivative notionals	0	0
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives | Purchased
Derivatives
Derivative notionals	0	0
Other derivative instruments, Trading derivatives
Derivatives
Derivative notionals	52,441,121	59,016,430
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	38,464,398	45,434,346
Other derivative instruments, Trading derivatives | Interest rate swaps
Derivatives
Derivative notionals	24,197,468	31,906,549
Other derivative instruments, Trading derivatives | Interest rate futures and forwards
Derivatives
Derivative notionals	8,385,914	7,044,990
Other derivative instruments, Trading derivatives | Interest rate contract options | Written or Sold
Derivatives
Derivative notionals	2,979,791	3,311,751
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	2,901,225	3,171,056
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	10,213,786	10,278,174
Other derivative instruments, Trading derivatives | Foreign exchange swaps
Derivatives
Derivative notionals	4,622,283	4,567,977
Other derivative instruments, Trading derivatives | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	2,799,499	3,003,295
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written or Sold
Derivatives
Derivative notionals	1,389,887	1,343,520
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	1,402,117	1,363,382
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	1,018,652	742,697
Other derivative instruments, Trading derivatives | Equity swaps
Derivatives
Derivative notionals	174,378	131,344
Other derivative instruments, Trading derivatives | Equity futures and forwards
Derivatives
Derivative notionals	34,718	30,510
Other derivative instruments, Trading derivatives | Equity contract options | Written or Sold
Derivatives
Derivative notionals	406,820	305,627
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	402,736	275,216
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	368,379	396,986
Other derivative instruments, Trading derivatives | Commodity and other swaps
Derivatives
Derivative notionals	74,925	90,817
Other derivative instruments, Trading derivatives | Commodity and other futures and forwards
Derivatives
Derivative notionals	106,114	106,021
Other derivative instruments, Trading derivatives | Commodity and other contract options | Written or Sold
Derivatives
Derivative notionals	99,148	104,581
Other derivative instruments, Trading derivatives | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	88,192	95,567
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	2,375,906	2,164,227
Other derivative instruments, Trading derivatives | Credit derivatives | Written or Sold
Derivatives
Derivative notionals	1,175,657	1,063,858
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	1,200,249	1,100,369
Other derivative instruments, Management hedges
Derivatives
Derivative notionals	128,028	131,014
Other derivative instruments, Management hedges | Interest rate contracts
Derivatives
Derivative notionals	76,886	83,073
Other derivative instruments, Management hedges | Interest rate swaps
Derivatives
Derivative notionals	31,024	31,945
Other derivative instruments, Management hedges | Interest rate futures and forwards
Derivatives
Derivative notionals	38,226	42,305
Other derivative instruments, Management hedges | Interest rate contract options | Written or Sold
Derivatives
Derivative notionals	3,141	3,913
Other derivative instruments, Management hedges | Interest rate contract options | Purchased
Derivatives
Derivative notionals	4,495	4,910
Other derivative instruments, Management hedges | Foreign exchange contracts
Derivatives
Derivative notionals	28,844	31,923
Other derivative instruments, Management hedges | Foreign exchange swaps
Derivatives
Derivative notionals	23,754	23,990
Other derivative instruments, Management hedges | Foreign exchange futures, forwards and spot
Derivatives
Derivative notionals	5,090	7,069
Other derivative instruments, Management hedges | Foreign exchange contract options | Written or Sold
Derivatives
Derivative notionals	0	432
Other derivative instruments, Management hedges | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	0	432
Other derivative instruments, Management hedges | Equity contracts
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Equity swaps
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Equity futures and forwards
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Equity contract options | Written or Sold
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Equity contract options | Purchased
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Commodity and other contracts
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Commodity and other swaps
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Commodity and other futures and forwards
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Commodity and other contract options | Written or Sold
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Credit derivatives
Derivatives
Derivative notionals	22,298	16,018
Other derivative instruments, Management hedges | Credit derivatives | Written or Sold
Derivatives
Derivative notionals	0	0
Other derivative instruments, Management hedges | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 22,298	$ 16,018