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FAIR VALUE MEASUREMENT - Items Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]    
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting $ (157,370) $ (111,400)
Trading account assets 375,079 276,140
Netting of cash collateral received (63,915) (44,353)
Investments 447,359 368,563
Loans 6,854 4,085
Liabilities, Fair Value Disclosure [Abstract]    
Securities loaned and sold under agreements to repurchase, netting (157,370) (111,400)
Netting of cash collateral paid (45,628) (38,919)
Fair Value Measured at Net Asset Value Per Share    
Liabilities, Fair Value Disclosure [Abstract]    
Alternative investment funds, fair value 152 170
Recurring    
Assets, Fair Value Disclosure [Abstract]    
Securities borrowed and purchased under agreements to resell 335,393 254,556
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting (150,189) (101,363)
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell 185,204 153,193
Investments 335,998 281,257
Loans 6,854 4,085
Mortgage servicing rights (MSRs) 336 495
Total assets before netting 1,497,067 1,148,686
Total assets, Netting (578,983) (420,686)
Total assets 918,084 728,000
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits 1,958 2,319
Securities loaned and sold under agreements to repurchase, gross 157,275 112,324
Securities loaned and sold under agreements to repurchase, netting (97,069) (71,673)
Securities loaned and sold under agreements to repurchase 60,206 40,651
Securities sold, not yet purchased 100,044 72,442
Other trading liabilities 100,070 72,466
Short-term borrowings 4,683 4,946
Long-term debt 67,063 55,783
Total liabilities, gross 816,348 615,498
Total liabilities, netting (507,576) (385,562)
Total liabilities 308,772 229,936
Recurring | Trading derivatives liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 470,268 346,926
Cash collateral received 8,196 14,391
Netting agreements (364,879) (274,970)
Netting of cash collateral paid (45,628) (38,919)
Total trading derivatives and cash collateral, liability 478,464 361,317
Netting, Liabilities, total of netting agreements and cash collateral received (410,507) (313,889)
Total derivative liabilities 67,957 47,428
Gross cash collateral received 72,111 58,744
Recurring | Trading derivatives liabilities | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 222,411 177,655
Recurring | Trading derivatives liabilities | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 156,066 110,732
Recurring | Trading derivatives liabilities | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 63,569 30,486
Recurring | Trading derivatives liabilities | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 18,093 17,315
Recurring | Trading derivatives liabilities | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 10,129 10,738
Recurring | Non-trading derivatives and other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Netting, Liabilities, total of netting agreements and cash collateral received 0 0
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross 6,835 6,343
Total non-trading derivatives and other financial liabilities measured on recurring basis 6,835 6,343
Recurring | Trading account liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Other trading liabilities 26 24
Recurring | Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 42,930 27,671
Investments 43,918 35,230
Recurring | Mortgage-backed securities - Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 731 696
Investments 571 793
Recurring | Mortgage-backed securities - Commercial    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,029 1,693
Investments 50 74
Recurring | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 44,690 30,060
Investments 44,539 36,097
Recurring | U.S. Treasury and federal agency securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 66,798 29,895
Investments 146,204 111,418
Recurring | State and municipal    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,318 2,637
Investments 3,719 4,978
Recurring | Foreign government    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 83,389 71,326
Investments 124,968 111,249
Recurring | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 20,822 18,891
Investments 10,500 11,271
Recurring | Marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 66,479 51,641
Investments 515 458
Recurring | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 2,382 2,716
Investments 278 522
Recurring | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 12,240 12,041
Investments 4,876 4,730
Recurring | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 399 534
Recurring | Trading securities (excluding trading account derivatives)    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 298,118 219,207
Recurring | Trading account assets    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 472,977 358,330
Gross cash collateral paid 32,778 17,926
Trading derivative, asset, gross net cash collateral paid 505,755 376,256
Less: Netting agreements to assets (364,879) (274,970)
Netting of cash collateral received (63,915) (44,353)
Netting, Assets, total of netting agreements and cash collateral received (428,794) (319,323)
Trading derivatives 76,961 56,933
Liabilities, Fair Value Disclosure [Abstract]    
Gross cash collateral paid 78,406 56,845
Recurring | Trading account assets | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 241,461 197,668
Recurring | Trading account assets | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 156,670 107,570
Recurring | Trading account assets | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 50,519 28,471
Recurring | Trading account assets | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 14,538 14,212
Recurring | Trading account assets | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 9,789 10,409
Recurring | Non-trading derivatives and other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Netting, Assets, total of netting agreements and cash collateral received 0 0
Total other assets and cash collateral, gross 14,613 12,830
Other assets 14,613 12,830
Recurring | Level 1    
Assets, Fair Value Disclosure [Abstract]    
Securities borrowed and purchased under agreements to resell 0 0
Investments 229,701 181,297
Loans 0 0
Mortgage servicing rights (MSRs) 0 0
Total assets before netting $ 424,489 $ 307,192
Total as a percentage of gross assets 29.00% 27.20%
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits $ 0 $ 0
Securities loaned and sold under agreements to repurchase, gross 0 0
Securities sold, not yet purchased 85,353 60,429
Other trading liabilities 85,353 60,429
Short-term borrowings 0 0
Long-term debt 0 0
Total liabilities, gross $ 92,196 $ 66,861
Total as a percentage of gross liabilities 11.40% 11.10%
Recurring | Level 1 | Trading derivatives liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability $ 81 $ 152
Recurring | Level 1 | Trading derivatives liabilities | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 25 8
Recurring | Level 1 | Trading derivatives liabilities | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 3 0
Recurring | Level 1 | Trading derivatives liabilities | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 53 144
Recurring | Level 1 | Trading derivatives liabilities | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 0 0
Recurring | Level 1 | Trading derivatives liabilities | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 0 0
Recurring | Level 1 | Non-trading derivatives and other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Non-trading derivatives and other financial liabilities measured on recurring basis 6,762 6,280
Recurring | Level 1 | Trading account liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Other trading liabilities 0 0
Recurring | Level 1 | Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Mortgage-backed securities - Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Mortgage-backed securities - Commercial    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | U.S. Treasury and federal agency securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 64,529 26,159
Investments 146,032 106,103
Recurring | Level 1 | State and municipal    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Foreign government    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 68,195 50,948
Investments 77,056 69,957
Recurring | Level 1 | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,607 1,332
Investments 6,326 5,150
Recurring | Level 1 | Marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 54,117 41,663
Investments 287 87
Recurring | Level 1 | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 74
Investments 0 0
Recurring | Level 1 | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 0 0
Recurring | Level 1 | Trading securities (excluding trading account derivatives)    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 188,448 120,176
Recurring | Level 1 | Trading account assets    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 110 91
Recurring | Level 1 | Trading account assets | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 42 7
Recurring | Level 1 | Trading account assets | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 2 1
Recurring | Level 1 | Trading account assets | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 66 83
Recurring | Level 1 | Trading account assets | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 0 0
Recurring | Level 1 | Trading account assets | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 0 0
Recurring | Level 1 | Non-trading derivatives and other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Other assets, gross 6,230 5,628
Recurring | Level 2    
Assets, Fair Value Disclosure [Abstract]    
Securities borrowed and purchased under agreements to resell 335,073 254,253
Investments 104,755 98,701
Loans 4,869 3,683
Mortgage servicing rights (MSRs) 0 0
Total assets before netting $ 1,023,665 $ 815,535
Total as a percentage of gross assets 69.90% 72.10%
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits $ 1,752 $ 2,104
Securities loaned and sold under agreements to repurchase, gross 156,644 111,567
Securities sold, not yet purchased 14,477 11,965
Other trading liabilities 14,477 11,989
Short-term borrowings 4,464 4,933
Long-term debt 41,853 38,614
Total liabilities, gross $ 679,937 $ 511,211
Total as a percentage of gross liabilities 84.10% 85.00%
Recurring | Level 2 | Trading derivatives liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability $ 460,675 $ 341,941
Recurring | Level 2 | Trading derivatives liabilities | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 220,607 176,480
Recurring | Level 2 | Trading derivatives liabilities | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 155,441 110,180
Recurring | Level 2 | Trading derivatives liabilities | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 58,212 28,506
Recurring | Level 2 | Trading derivatives liabilities | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 17,393 16,542
Recurring | Level 2 | Trading derivatives liabilities | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 9,022 10,233
Recurring | Level 2 | Non-trading derivatives and other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Non-trading derivatives and other financial liabilities measured on recurring basis 72 63
Recurring | Level 2 | Trading account liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Other trading liabilities 0 24
Recurring | Level 2 | Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 42,903 27,661
Investments 43,888 35,198
Recurring | Level 2 | Mortgage-backed securities - Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 391 573
Investments 571 793
Recurring | Level 2 | Mortgage-backed securities - Commercial    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 893 1,632
Investments 50 74
Recurring | Level 2 | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 44,187 29,866
Investments 44,509 36,065
Recurring | Level 2 | U.S. Treasury and federal agency securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 2,269 3,736
Investments 172 5,315
Recurring | Level 2 | State and municipal    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,224 2,573
Investments 2,885 4,355
Recurring | Level 2 | Foreign government    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 15,143 20,326
Investments 47,644 41,196
Recurring | Level 2 | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 18,840 17,246
Investments 4,114 6,076
Recurring | Level 2 | Marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 12,289 9,878
Investments 228 371
Recurring | Level 2 | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 776 1,539
Investments 277 500
Recurring | Level 2 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 11,295 11,412
Investments 4,876 4,730
Recurring | Level 2 | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 50 93
Recurring | Level 2 | Trading securities (excluding trading account derivatives)    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 106,023 96,576
Recurring | Level 2 | Trading account assets    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 464,562 355,121
Recurring | Level 2 | Trading account assets | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 238,026 196,493
Recurring | Level 2 | Trading account assets | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 155,994 107,022
Recurring | Level 2 | Trading account assets | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 48,362 28,148
Recurring | Level 2 | Trading account assets | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 13,546 13,498
Recurring | Level 2 | Trading account assets | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 8,634 9,960
Recurring | Level 2 | Non-trading derivatives and other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Other assets, gross 8,383 7,201
Recurring | Level 3    
Assets, Fair Value Disclosure [Abstract]    
Securities borrowed and purchased under agreements to resell 320 303
Investments 1,542 1,259
Loans 1,985 402
Mortgage servicing rights (MSRs) 336 495
Total assets before netting $ 16,135 $ 8,033
Total as a percentage of gross assets 1.10% 0.70%
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits $ 206 $ 215
Securities loaned and sold under agreements to repurchase, gross 631 757
Securities sold, not yet purchased 214 48
Other trading liabilities 240 48
Short-term borrowings 219 13
Long-term debt 25,210 17,169
Total liabilities, gross $ 36,019 $ 23,035
Total as a percentage of gross liabilities 4.50% 3.80%
Recurring | Level 3 | Trading derivatives liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability $ 9,512 $ 4,833
Recurring | Level 3 | Trading derivatives liabilities | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 1,779 1,167
Recurring | Level 3 | Trading derivatives liabilities | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 622 552
Recurring | Level 3 | Trading derivatives liabilities | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 5,304 1,836
Recurring | Level 3 | Trading derivatives liabilities | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 700 773
Recurring | Level 3 | Trading derivatives liabilities | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 1,107 505
Recurring | Level 3 | Non-trading derivatives and other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Non-trading derivatives and other financial liabilities measured on recurring basis 1 0
Recurring | Level 3 | Trading account liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Other trading liabilities 26 0
Recurring | Level 3 | Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 27 10
Investments 30 32
Recurring | Level 3 | Mortgage-backed securities - Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 340 123
Investments 0 0
Recurring | Level 3 | Mortgage-backed securities - Commercial    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 136 61
Investments 0 0
Recurring | Level 3 | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 503 194
Investments 30 32
Recurring | Level 3 | U.S. Treasury and federal agency securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 3 | State and municipal    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 94 64
Investments 834 623
Recurring | Level 3 | Foreign government    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 51 52
Investments 268 96
Recurring | Level 3 | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 375 313
Investments 60 45
Recurring | Level 3 | Marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 73 100
Investments 0 0
Recurring | Level 3 | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,606 1,177
Investments 1 22
Recurring | Level 3 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 945 555
Investments 0 0
Recurring | Level 3 | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 349 441
Recurring | Level 3 | Trading securities (excluding trading account derivatives)    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 3,647 2,455
Recurring | Level 3 | Trading account assets    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 8,305 3,118
Recurring | Level 3 | Trading account assets | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 3,393 1,168
Recurring | Level 3 | Trading account assets | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 674 547
Recurring | Level 3 | Trading account assets | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 2,091 240
Recurring | Level 3 | Trading account assets | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 992 714
Recurring | Level 3 | Trading account assets | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, gross 1,155 449
Recurring | Level 3 | Non-trading derivatives and other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Other assets, gross $ 0 $ 1