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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

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end, presented on a gross basis even when derivatives and other financial assets are subject to master netting arrangements and qualify for net presentation in the statement of financial position. + References No definition available. + Details
Name: | c_AssetsBeforeEffectsOfMasterNettingArrangements
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate of fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset; obligation to return cash collateral under master netting arrangements; and amount of liability associated with funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. + References No definition available. + Details
Name: | c_AssetsDerivativeAssetFairValueGrossLiabilityObligationToReturnCashOffsetAndSecuritiesPurchasedUnderAgreementsToResellLiability
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the aggregate of the fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position, and the amount of the right to reclaim cash collateral net of the amount offset against net derivative instrument positions under master netting arrangements. + References No definition available. + Details
Name: | c_DerivativeFairValueOfDerivativeAssetAndDerivativeCollateralRightToReclaimCashNet
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate of the fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position, and the amount of the obligation to return cash collateral net of the amount offset against net derivative instrument positions under master netting arrangements. + References No definition available. + Details
Name: | c_DerivativeFairValueOfDerivativeLiabilityAndDerivativeCollateralRightToReclaimCashNet
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents the amount that a bank with insufficient reserves at a Federal Reserve Bank borrows, at the federal funds rate, from another bank to meet its reserve requirements for that day and the amount of securities that an institution sells and agrees to repurchase at a specified date for a specified price, before effects of master netting arrangements. + References No definition available. + Details
Name: | c_FederalFundsPurchasedAndSecuritiesLoanedOrSoldUnderAgreementsToRepurchaseGross
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount shown on an entity's books for federal funds sold and securities borrowed or purchased under agreements to resell, before effects of master netting arrangements. + References No definition available. + Details
Name: | c_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellGross
Namespace Prefix: | c_
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