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FAIR VALUE MEASUREMENT - Items Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets, Fair Value Disclosure [Abstract]    
Federal funds sold and securities borrowed and purchased under agreements to resell, Netting $ (402,275) $ (323,772)
Trading account assets 562,254 442,747
Netting agreements (387,237) (334,900)
Netting of cash collateral received (28,789) (27,303)
Trading derivatives 54,497 60,599
Investments 450,732 476,657
Held at fair value 7,896 8,040
Liabilities, Fair Value Disclosure [Abstract]    
Federal funds purchased and securities loaned and sold under agreements to repurchase, Netting (402,275) (323,772)
Netting agreements (387,237) (334,900)
Netting of cash collateral paid (20,065) (28,570)
Total derivative liabilities 55,007 48,298
Fair Value Measured at Net Asset Value Per Share    
Liabilities, Fair Value Disclosure [Abstract]    
Investments measured at net asset value excluded from Level 3 34 23
Recurring    
Assets, Fair Value Disclosure [Abstract]    
Federal funds sold and securities borrowed and purchased under agreements to resell 558,296 462,670
Federal funds sold and securities borrowed and purchased under agreements to resell, Netting (393,518) (321,815)
Federal funds sold and securities borrowed and purchased under agreements to resell 164,778 140,855
Investments 246,877 227,431
Held at fair value 7,896 8,040
Mortgage servicing rights 748 760
Assets before netting 1,808,590 1,518,663
Netting, Assets, total of netting agreements and cash collateral received (809,544) (684,018)
Total assets 999,046 834,645
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits 3,684 3,608
Federal funds purchased and securities loaned and sold under agreements to repurchase, Gross 427,084 260,676
Federal funds purchased and securities loaned and sold under agreements to repurchase, Netting (224,892) (211,522)
Federal funds purchased and securities loaned and sold under agreements to repurchase 202,192 49,154
Securities sold, not yet purchased 105,226 85,536
Trading liabilities 105,236 85,548
Short-term borrowings 25,023 12,484
Long-term debt 129,817 112,719
Total liabilities, Gross 1,158,055 892,025
Total liabilities, Netting (632,194) (574,992)
Total liabilities 525,861 317,033
Recurring | Securities sold, not yet purchased    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 462,309 411,768
Total trading derivatives and cash collateral, liability 462,309 411,768
Netting agreements (387,237) (334,900)
Netting of cash collateral paid (20,065) (28,570)
Netting, Liabilities, total of netting agreements and cash collateral received (407,302) (363,470)
Total derivative liabilities 55,007 48,298
Recurring | Securities sold, not yet purchased | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 217,041 122,132
Recurring | Securities sold, not yet purchased | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 113,830 206,017
Recurring | Securities sold, not yet purchased | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 99,605 61,736
Recurring | Securities sold, not yet purchased | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 21,090 14,630
Recurring | Securities sold, not yet purchased | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 10,743 7,253
Recurring | Other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Netting of cash collateral paid   0
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross 4,902 5,222
Total other assets and cash collateral, gross 4,902 5,222
Recurring | Other trading liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 10 12
Recurring | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 94,319 64,928
Investments 36,648 29,931
Recurring | Mortgage securitizations - U.S. agency-sponsored    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 92,818 63,666
Investments 35,673 29,306
Recurring | Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 805 595
Investments 974 624
Recurring | Commercial    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 696 667
Investments 1 1
Recurring | U.S. Treasury and federal agency securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 160,139 149,355
Investments 37,018 52,379
Recurring | State and municipal    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 178 179
Investments 1,691 1,658
Recurring | Foreign government    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 124,233 74,855
Investments 161,641 133,359
Recurring | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 23,776 14,940
Investments 5,372 4,814
Recurring | Equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 75,782 48,808
Investments 202 151
Recurring | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 2,889 2,309
Investments 862 848
Recurring | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 26,441 26,774
Investments 2,995 3,887
Recurring | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 448 404
Recurring | Trading mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 507,757 382,148
Recurring | Trading account derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 470,523 422,802
Trading derivative, asset, gross net cash collateral paid 470,523 422,802
Netting agreements (387,237) (334,900)
Netting of cash collateral received (28,789) (27,303)
Total trading derivatives, netting (416,026) (362,203)
Trading derivatives 54,497 60,599
Recurring | Trading account derivatives | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 226,257 130,278
Recurring | Trading account derivatives | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 127,454 216,045
Recurring | Trading account derivatives | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 86,140 55,144
Recurring | Trading account derivatives | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 20,503 12,620
Recurring | Trading account derivatives | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 10,169 8,715
Recurring | Other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Total trading derivatives, netting   0
Total other assets and cash collateral, gross 16,493 14,812
Other assets 16,493 14,812
Recurring | Level 1    
Assets, Fair Value Disclosure [Abstract]    
Federal funds sold and securities borrowed and purchased under agreements to resell 0 0
Investments 121,559 116,900
Held at fair value 0 0
Mortgage servicing rights 0 0
Assets before netting $ 421,905 $ 343,336
Total as a percentage of gross assets 23.30% 22.60%
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits $ 0 $ 0
Federal funds purchased and securities loaned and sold under agreements to repurchase, Gross 0 0
Securities sold, not yet purchased 89,981 72,324
Trading liabilities 89,981 72,324
Short-term borrowings 0 0
Long-term debt 0 0
Total liabilities, Gross $ 94,888 $ 76,848
Total as a percentage of gross liabilities 8.20% 8.60%
Recurring | Level 1 | Securities sold, not yet purchased    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability $ 79 $ 46
Recurring | Level 1 | Securities sold, not yet purchased | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 11 6
Recurring | Level 1 | Securities sold, not yet purchased | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 0 0
Recurring | Level 1 | Securities sold, not yet purchased | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 68 40
Recurring | Level 1 | Securities sold, not yet purchased | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 0 0
Recurring | Level 1 | Securities sold, not yet purchased | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 0 0
Recurring | Level 1 | Other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Other liabilities, gross 4,828 4,478
Recurring | Level 1 | Other trading liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 0 0
Recurring | Level 1 | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Mortgage securitizations - U.S. agency-sponsored    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 0 0
Recurring | Level 1 | Commercial    
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 158,719 142,837
Investments 37,018 51,501
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 67,052 35,805
Investments 80,847 62,106
Recurring | Level 1 | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,129 1,197
Investments 3,580 3,163
Recurring | Level 1 | Equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 67,425 41,163
Investments 38 130
Recurring | Level 1 | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1 0
Investments 0 0
Recurring | Level 1 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 0
Investments 76 0
Recurring | Level 1 | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 0 0
Recurring | Level 1 | Trading mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 294,326 221,002
Recurring | Level 1 | Trading account derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 96 61
Recurring | Level 1 | Trading account derivatives | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 18 17
Recurring | Level 1 | Trading account derivatives | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 0 0
Recurring | Level 1 | Trading account derivatives | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 78 44
Recurring | Level 1 | Trading account derivatives | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 0 0
Recurring | Level 1 | Trading account derivatives | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 0 0
Recurring | Level 1 | Other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Other assets, gross 5,924 5,373
Recurring | Level 2    
Assets, Fair Value Disclosure [Abstract]    
Federal funds sold and securities borrowed and purchased under agreements to resell 558,114 462,542
Investments 123,909 109,455
Held at fair value 7,694 7,778
Mortgage servicing rights 0 0
Assets before netting $ 1,376,962 $ 1,166,133
Total as a percentage of gross assets 76.20% 76.80%
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits $ 3,457 $ 3,569
Federal funds purchased and securities loaned and sold under agreements to repurchase, Gross 426,002 260,286
Securities sold, not yet purchased 15,216 13,184
Trading liabilities 15,226 13,196
Short-term borrowings 24,666 12,187
Long-term debt 107,390 91,619
Total liabilities, Gross $ 1,030,139 $ 786,422
Total as a percentage of gross liabilities 88.90% 88.20%
Recurring | Level 2 | Securities sold, not yet purchased    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability $ 453,325 $ 404,821
Recurring | Level 2 | Securities sold, not yet purchased | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 214,916 120,097
Recurring | Level 2 | Securities sold, not yet purchased | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 113,218 205,487
Recurring | Level 2 | Securities sold, not yet purchased | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 95,449 58,642
Recurring | Level 2 | Securities sold, not yet purchased | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 20,235 13,960
Recurring | Level 2 | Securities sold, not yet purchased | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 9,507 6,635
Recurring | Level 2 | Other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Other liabilities, gross 73 744
Recurring | Level 2 | Other trading liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 10 12
Recurring | Level 2 | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 93,770 64,524
Investments 36,617 29,867
Recurring | Level 2 | Mortgage securitizations - U.S. agency-sponsored    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 92,427 63,365
Investments 35,642 29,270
Recurring | Level 2 | Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 705 528
Investments 974 596
Recurring | Level 2 | Commercial    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 638 631
Investments 1 1
Recurring | Level 2 | U.S. Treasury and federal agency securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,420 6,517
Investments 0 878
Recurring | Level 2 | State and municipal    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 177 168
Investments 1,177 1,230
Recurring | Level 2 | Foreign government    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 57,120 39,035
Investments 80,768 71,241
Recurring | Level 2 | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 22,411 13,474
Investments 1,563 1,505
Recurring | Level 2 | Equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 8,095 7,479
Investments 3 7
Recurring | Level 2 | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 2,640 2,131
Investments 862 846
Recurring | Level 2 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 26,019 26,441
Investments 2,919 3,881
Recurring | Level 2 | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 0 0
Recurring | Level 2 | Trading mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 211,652 159,769
Recurring | Level 2 | Trading account derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 465,024 417,165
Recurring | Level 2 | Trading account derivatives | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 224,304 128,562
Recurring | Level 2 | Trading account derivatives | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 126,735 215,330
Recurring | Level 2 | Trading account derivatives | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 85,119 53,734
Recurring | Level 2 | Trading account derivatives | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 19,592 11,546
Recurring | Level 2 | Trading account derivatives | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 9,274 7,993
Recurring | Level 2 | Other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Other assets, gross 10,569 9,424
Recurring | Level 3    
Assets, Fair Value Disclosure [Abstract]    
Federal funds sold and securities borrowed and purchased under agreements to resell 182 128
Investments 1,409 1,076
Held at fair value 202 262
Mortgage servicing rights 748 760
Assets before netting $ 9,723 $ 9,194
Total as a percentage of gross assets 0.50% 0.60%
Liabilities, Fair Value Disclosure [Abstract]    
Interest-bearing deposits $ 227 $ 39
Federal funds purchased and securities loaned and sold under agreements to repurchase, Gross 1,082 390
Securities sold, not yet purchased 29 28
Trading liabilities 29 28
Short-term borrowings 357 297
Long-term debt 22,427 21,100
Total liabilities, Gross $ 33,028 $ 28,755
Total as a percentage of gross liabilities 2.90% 3.20%
Recurring | Level 3 | Securities sold, not yet purchased    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability $ 8,905 $ 6,901
Recurring | Level 3 | Securities sold, not yet purchased | Interest rate contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 2,114 2,029
Recurring | Level 3 | Securities sold, not yet purchased | Foreign exchange contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 612 530
Recurring | Level 3 | Securities sold, not yet purchased | Equity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 4,088 3,054
Recurring | Level 3 | Securities sold, not yet purchased | Commodity contracts    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 855 670
Recurring | Level 3 | Securities sold, not yet purchased | Credit derivatives    
Liabilities, Fair Value Disclosure [Abstract]    
Trading derivatives, liability 1,236 618
Recurring | Level 3 | Other financial liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Other liabilities, gross 1 0
Recurring | Level 3 | Other trading liabilities    
Liabilities, Fair Value Disclosure [Abstract]    
Trading liabilities 0 0
Recurring | Level 3 | Mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 549 404
Investments 31 64
Recurring | Level 3 | Mortgage securitizations - U.S. agency-sponsored    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 391 301
Investments 31 36
Recurring | Level 3 | Residential    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 100 67
Investments 0 28
Recurring | Level 3 | Commercial    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 58 36
Investments 0 0
Recurring | Level 3 | U.S. Treasury and federal agency securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 0 1
Investments 0 0
Recurring | Level 3 | State and municipal    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1 11
Investments 514 428
Recurring | Level 3 | Foreign government    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 61 15
Investments 26 12
Recurring | Level 3 | Corporate    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 236 269
Investments 229 146
Recurring | Level 3 | Equity securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 262 166
Investments 161 14
Recurring | Level 3 | Asset-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 248 178
Investments 0 2
Recurring | Level 3 | Other debt securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 422 333
Investments 0 6
Recurring | Level 3 | Non-marketable equity securities    
Assets, Fair Value Disclosure [Abstract]    
Investments 448 404
Recurring | Level 3 | Trading mortgage-backed securities    
Assets, Fair Value Disclosure [Abstract]    
Trading account assets 1,779 1,377
Recurring | Level 3 | Trading account derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 5,403 5,576
Recurring | Level 3 | Trading account derivatives | Interest rate contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 1,935 1,699
Recurring | Level 3 | Trading account derivatives | Foreign exchange contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 719 715
Recurring | Level 3 | Trading account derivatives | Equity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 943 1,366
Recurring | Level 3 | Trading account derivatives | Commodity contracts    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 911 1,074
Recurring | Level 3 | Trading account derivatives | Credit derivatives    
Assets, Fair Value Disclosure [Abstract]    
Trading derivatives, asset, Gross 895 722
Recurring | Level 3 | Other financial assets    
Assets, Fair Value Disclosure [Abstract]    
Other assets, gross $ 0 $ 15