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FAIR VALUE MEASUREMENT (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Assets and Liabilities Measured at Fair Value on a Recurring Basis          
Weighted average FICO score of the underlying collateral for Alt-A mortgage securities recorded at fair value, low end of range     680    
Weighted average FICO score of the underlying collateral for Alt-A mortgage securities recorded at fair value, high end of range     720    
Maximum percentage of underlying collateral where FICO scores are greater than 720     30.00%    
Assets, Fair Value Disclosure [Abstract]          
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting $ (54,058,000,000) [1]   $ (54,058,000,000) [1]   $ (43,245,000,000) [1]
Trading securities 290,822,000,000   290,822,000,000   285,928,000,000
Netting of cash collateral received (40,435,000,000)   (40,435,000,000)   (34,893,000,000)
Investments 333,047,000,000   333,047,000,000   308,980,000,000
Loans 4,411,000,000   4,411,000,000   5,029,000,000
Mortgage servicing rights (MSRs) 2,093,000,000   2,093,000,000   2,718,000,000
Liabilities, Fair Value Disclosure [Abstract]          
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Netting (54,058,000,000) [1]   (54,058,000,000) [1]   (43,245,000,000) [1]
Netting of cash collateral paid (43,789,000,000)   (43,789,000,000)   (39,094,000,000)
Assets transferred from Level 1 to Level 2 300,000,000 47,000,000 2,100,000,000 1,000,000,000  
Assets transferred from Level 2 to Level 1 700,000,000 33,000,000 3,700,000,000 49,100,000,000  
Liabilities transferred from Level 1 to Level 2     1,400,000,000    
Mortgage-backed securities - U.S. agency-sponsored
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 19,779,000,000 [2]   19,779,000,000 [2]   23,955,000,000 [2]
Mortgage-backed securities - Commercial
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,962,000,000 [2]   2,962,000,000 [2]   2,574,000,000 [2]
Mortgage-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 26,627,000,000 [2]   26,627,000,000 [2]   30,606,000,000 [2]
U.S. Treasury and federal agency securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 21,713,000,000   21,713,000,000   14,837,000,000
State and municipal securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,713,000,000   2,713,000,000   3,207,000,000
Foreign government
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 76,133,000,000   76,133,000,000   74,856,000,000
Corporate
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 28,388,000,000   28,388,000,000   30,534,000,000
Equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 55,662,000,000   55,662,000,000   61,776,000,000
Asset-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 4,653,000,000 [2]   4,653,000,000 [2]   5,616,000,000 [2]
Other debt securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 17,239,000,000 [3]   17,239,000,000 [3]   11,675,000,000 [3]
Recurring | Level 1
          
Assets, Fair Value Disclosure [Abstract]          
Investments 137,241,000,000 [4]   137,241,000,000 [4]   106,905,000,000 [5]
Total assets, Gross 259,212,000,000 [4]   259,212,000,000 [4]   233,316,000,000 [5]
Total as a percentage of gross assets 17.30% [4],[6]   17.30% [4],[6]   15.40% [5],[6]
Liabilities, Fair Value Disclosure [Abstract]          
Securities sold, not yet purchased 63,791,000,000 [4]   63,791,000,000 [4]   51,035,000,000 [5]
Total liabilities, Gross 67,145,000,000 [4]   67,145,000,000 [4]   57,222,000,000 [5]
Total as a percentage of gross liabilities 7.00% [4],[6]   7.00% [4],[6]   5.90% [5],[6]
Recurring | Level 1 | Trading derivatives liabilities
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 3,354,000,000 [4]   3,354,000,000 [4]   6,187,000,000 [5]
Total trading derivatives and cash collateral, liability 3,354,000,000 [4]   3,354,000,000 [4]    
Recurring | Level 1 | Trading derivatives liabilities | Interest rate contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 14,000,000 [4]   14,000,000 [4]   12,000,000 [5]
Recurring | Level 1 | Trading derivatives liabilities | Foreign exchange contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 24,000,000 [4]   24,000,000 [4]   29,000,000 [5]
Recurring | Level 1 | Trading derivatives liabilities | Equity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 2,959,000,000 [4]   2,959,000,000 [4]   5,783,000,000 [5]
Recurring | Level 1 | Trading derivatives liabilities | Commodity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 357,000,000 [4]   357,000,000 [4]   363,000,000 [5]
Recurring | Level 1 | Mortgage-backed securities - U.S. agency-sponsored
          
Assets, Fair Value Disclosure [Abstract]          
Investments         0 [5]
Recurring | Level 1 | Mortgage-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Investments         0 [5]
Recurring | Level 1 | U.S. Treasury and federal agency securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 17,413,000,000 [4]   17,413,000,000 [4]   12,080,000,000 [5]
Investments 95,333,000,000 [4]   95,333,000,000 [4]   69,139,000,000 [5]
Recurring | Level 1 | Foreign government
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 50,150,000,000 [4]   50,150,000,000 [4]   49,220,000,000 [5]
Investments 39,097,000,000 [4]   39,097,000,000 [4]   35,179,000,000 [5]
Recurring | Level 1 | Corporate
          
Assets, Fair Value Disclosure [Abstract]          
Investments 5,000,000 [4]   5,000,000 [4]   4,000,000 [5]
Recurring | Level 1 | Equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 51,172,000,000 [4]   51,172,000,000 [4]   58,761,000,000 [5]
Investments 2,806,000,000 [4]   2,806,000,000 [4]   2,583,000,000 [5]
Recurring | Level 1 | Trading account assets
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 3,236,000,000 [4]   3,236,000,000 [4]   6,350,000,000 [5]
Recurring | Level 1 | Trading account assets | Interest rate contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 18,000,000 [4]   18,000,000 [4]   11,000,000 [5]
Recurring | Level 1 | Trading account assets | Foreign exchange contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 12,000,000 [4]   12,000,000 [4]   40,000,000 [5]
Recurring | Level 1 | Trading account assets | Equity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 2,901,000,000 [4]   2,901,000,000 [4]   5,793,000,000 [5]
Recurring | Level 1 | Trading account assets | Commodity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 305,000,000 [4]   305,000,000 [4]   506,000,000 [5]
Recurring | Level 1 | Trading securities (excluding trading account derivatives)
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 118,735,000,000 [4]   118,735,000,000 [4]   120,061,000,000 [5]
Recurring | Level 2
          
Assets, Fair Value Disclosure [Abstract]          
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Gross 176,675,000,000 [4]   176,675,000,000 [4]   172,848,000,000 [5]
Investments 156,913,000,000 [4]   156,913,000,000 [4]   174,570,000,000 [5]
Loans 1,463,000,000 [4],[7]   1,463,000,000 [4],[7]   886,000,000 [5],[7]
Total assets, Gross 1,200,333,000,000 [4]   1,200,333,000,000 [4]   1,234,714,000,000 [5]
Total as a percentage of gross assets 79.90% [4],[6]   79.90% [4],[6]   81.60% [5],[6]
Liabilities, Fair Value Disclosure [Abstract]          
Interest-bearing deposits 986,000,000 [4]   986,000,000 [4]   787,000,000 [5]
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Gross 82,845,000,000 [4]   82,845,000,000 [4]   85,576,000,000 [5]
Securities sold, not yet purchased 14,402,000,000 [4]   14,402,000,000 [4]   9,883,000,000 [5]
Short-term borrowings 1,353,000,000 [4]   1,353,000,000 [4]   3,663,000,000 [5]
Long-term debt, at fair value 18,897,000,000 [4]   18,897,000,000 [4]   19,256,000,000 [5]
Total liabilities, Gross 870,546,000,000 [4]   870,546,000,000 [4]   894,749,000,000 [5]
Total as a percentage of gross liabilities 90.70% [4],[6]   90.70% [4],[6]   91.90% [5],[6]
Recurring | Level 2 | Trading derivatives liabilities
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 749,637,000,000 [4]   749,637,000,000 [4]   773,865,000,000 [5]
Total trading derivatives and cash collateral, liability 749,637,000,000 [4]   749,637,000,000 [4]    
Recurring | Level 2 | Trading derivatives liabilities | Interest rate contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 530,491,000,000 [4]   530,491,000,000 [4]   614,586,000,000 [5]
Recurring | Level 2 | Trading derivatives liabilities | Foreign exchange contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 141,260,000,000 [4]   141,260,000,000 [4]   87,978,000,000 [5]
Recurring | Level 2 | Trading derivatives liabilities | Equity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 29,367,000,000 [4]   29,367,000,000 [4]   26,178,000,000 [5]
Recurring | Level 2 | Trading derivatives liabilities | Commodity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 10,901,000,000 [4]   10,901,000,000 [4]   7,613,000,000 [5]
Recurring | Level 2 | Trading derivatives liabilities | Credit derivatives
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 37,618,000,000 [4]   37,618,000,000 [4]   37,510,000,000 [5]
Recurring | Level 2 | Non-trading derivatives and other financial liabilities
          
Liabilities, Fair Value Disclosure [Abstract]          
Other liabilities, gross 2,426,000,000 [4]   2,426,000,000 [4]   1,719,000,000 [5]
Recurring | Level 2 | Mortgage-backed securities - U.S. agency-sponsored
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 18,990,000,000 [4]   18,990,000,000 [4]   22,861,000,000 [5]
Investments 36,776,000,000 [4]   36,776,000,000 [4]   41,810,000,000 [5]
Recurring | Level 2 | Mortgage-backed securities - Residential
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 1,396,000,000 [4]   1,396,000,000 [4]   1,223,000,000 [5]
Investments 9,277,000,000 [4]   9,277,000,000 [4]   10,103,000,000 [5]
Recurring | Level 2 | Mortgage-backed securities - Commercial
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,408,000,000 [4]   2,408,000,000 [4]   2,318,000,000 [5]
Investments 554,000,000 [4]   554,000,000 [4]   453,000,000 [5]
Recurring | Level 2 | Mortgage-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 22,794,000,000 [4]   22,794,000,000 [4]   26,402,000,000 [5]
Investments 46,607,000,000 [4]   46,607,000,000 [4]   52,366,000,000 [5]
Recurring | Level 2 | U.S. Treasury and federal agency securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 4,293,000,000 [4]   4,293,000,000 [4]   2,757,000,000 [5]
Investments 16,547,000,000 [4]   16,547,000,000 [4]   18,449,000,000 [5]
Recurring | Level 2 | State and municipal securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,462,000,000 [4]   2,462,000,000 [4]   2,985,000,000 [5]
Investments 10,629,000,000 [4]   10,629,000,000 [4]   17,297,000,000 [5]
Recurring | Level 2 | Foreign government
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 25,598,000,000 [4]   25,598,000,000 [4]   25,220,000,000 [5]
Investments 55,943,000,000 [4]   55,943,000,000 [4]   60,948,000,000 [5]
Recurring | Level 2 | Corporate
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 27,174,000,000 [4]   27,174,000,000 [4]   28,699,000,000 [5]
Investments 13,591,000,000 [4]   13,591,000,000 [4]   10,841,000,000 [5]
Recurring | Level 2 | Equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,535,000,000 [4]   2,535,000,000 [4]   1,958,000,000 [5]
Investments 419,000,000 [4]   419,000,000 [4]   336,000,000 [5]
Recurring | Level 2 | Asset-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 1,302,000,000 [4]   1,302,000,000 [4]   1,274,000,000 [5]
Investments 12,259,000,000 [4]   12,259,000,000 [4]   13,314,000,000 [5]
Recurring | Level 2 | Other debt securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 12,500,000,000 [4]   12,500,000,000 [4]   8,491,000,000 [5]
Investments 645,000,000 [4]   645,000,000 [4]   661,000,000 [5]
Recurring | Level 2 | Non-marketable equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Investments 273,000,000 [4]   273,000,000 [4]   358,000,000 [5]
Recurring | Level 2 | Trading account assets
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 756,378,000,000 [4]   756,378,000,000 [4]   778,813,000,000 [5]
Recurring | Level 2 | Trading account assets | Interest rate contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 545,414,000,000 [4]   545,414,000,000 [4]   624,902,000,000 [5]
Recurring | Level 2 | Trading account assets | Foreign exchange contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 141,374,000,000 [4]   141,374,000,000 [4]   91,189,000,000 [5]
Recurring | Level 2 | Trading account assets | Equity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 20,283,000,000 [4]   20,283,000,000 [4]   17,611,000,000 [5]
Recurring | Level 2 | Trading account assets | Commodity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 11,225,000,000 [4]   11,225,000,000 [4]   7,775,000,000 [5]
Recurring | Level 2 | Trading account assets | Credit derivatives
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 38,082,000,000 [4]   38,082,000,000 [4]   37,336,000,000 [5]
Recurring | Level 2 | Non-trading derivatives and other financial assets
          
Assets, Fair Value Disclosure [Abstract]          
Other assets, gross 10,246,000,000 [4]   10,246,000,000 [4]   9,811,000,000 [5]
Recurring | Level 2 | Trading securities (excluding trading account derivatives)
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 98,658,000,000 [4]   98,658,000,000 [4]   97,786,000,000 [5]
Recurring | Level 3
          
Assets, Fair Value Disclosure [Abstract]          
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Gross 3,479,000,000   3,479,000,000   3,566,000,000
Investments 8,028,000,000   8,028,000,000   9,741,000,000
Loans 2,948,000,000 [7]   2,948,000,000 [7]   4,143,000,000 [7]
Mortgage servicing rights (MSRs) 2,093,000,000   2,093,000,000   2,718,000,000
Total assets, Gross 42,417,000,000   42,417,000,000   45,685,000,000
Total as a percentage of gross assets 2.80% [6]   2.80% [6]   3.00% [6]
Liabilities, Fair Value Disclosure [Abstract]          
Interest-bearing deposits 805,000,000   805,000,000   890,000,000
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Gross 1,034,000,000   1,034,000,000   902,000,000
Securities sold, not yet purchased 368,000,000   368,000,000   590,000,000
Short-term borrowings 101,000,000   101,000,000   29,000,000
Long-term debt, at fair value 7,558,000,000   7,558,000,000   7,621,000,000
Total liabilities, Gross 22,323,000,000   22,323,000,000   21,109,000,000
Total as a percentage of gross liabilities 2.30% [6]   2.30% [6]   2.20% [6]
Recurring | Level 3 | Trading derivatives liabilities
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 12,450,000,000   12,450,000,000   11,067,000,000
Total trading derivatives and cash collateral, liability 12,450,000,000   12,450,000,000    
Recurring | Level 3 | Trading derivatives liabilities | Interest rate contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 3,597,000,000   3,597,000,000   2,628,000,000
Recurring | Level 3 | Trading derivatives liabilities | Foreign exchange contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 379,000,000   379,000,000   630,000,000
Recurring | Level 3 | Trading derivatives liabilities | Equity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 3,115,000,000   3,115,000,000   2,331,000,000
Recurring | Level 3 | Trading derivatives liabilities | Commodity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 2,077,000,000   2,077,000,000   2,194,000,000
Recurring | Level 3 | Trading derivatives liabilities | Credit derivatives
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 3,282,000,000   3,282,000,000   3,284,000,000
Recurring | Level 3 | Non-trading derivatives and other financial liabilities
          
Liabilities, Fair Value Disclosure [Abstract]          
Other liabilities, gross 7,000,000   7,000,000   10,000,000
Recurring | Level 3 | Mortgage-backed securities - U.S. agency-sponsored
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 789,000,000   789,000,000   1,094,000,000
Investments 92,000,000   92,000,000   187,000,000
Recurring | Level 3 | Mortgage-backed securities - Residential
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,490,000,000   2,490,000,000   2,854,000,000
Investments 13,000,000   13,000,000   102,000,000
Recurring | Level 3 | Mortgage-backed securities - Commercial
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 554,000,000   554,000,000   256,000,000
Investments 10,000,000   10,000,000    
Recurring | Level 3 | Mortgage-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 3,833,000,000   3,833,000,000   4,204,000,000
Investments 115,000,000   115,000,000   289,000,000
Recurring | Level 3 | U.S. Treasury and federal agency securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 7,000,000   7,000,000    
Investments 6,000,000   6,000,000   8,000,000
Recurring | Level 3 | State and municipal securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 251,000,000   251,000,000   222,000,000
Investments 2,284,000,000   2,284,000,000   1,643,000,000
Recurring | Level 3 | Foreign government
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 385,000,000   385,000,000   416,000,000
Investments 620,000,000   620,000,000   344,000,000
Recurring | Level 3 | Corporate
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 1,214,000,000   1,214,000,000   1,835,000,000
Investments 362,000,000   362,000,000   285,000,000
Recurring | Level 3 | Equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 1,955,000,000   1,955,000,000   1,057,000,000
Investments 761,000,000   761,000,000   815,000,000
Recurring | Level 3 | Asset-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 3,351,000,000   3,351,000,000   4,342,000,000
Investments 584,000,000   584,000,000   1,960,000,000
Recurring | Level 3 | Other debt securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 4,739,000,000   4,739,000,000   3,184,000,000
Investments 65,000,000   65,000,000   50,000,000
Recurring | Level 3 | Non-marketable equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Investments 3,231,000,000   3,231,000,000   4,347,000,000
Recurring | Level 3 | Trading account assets
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 10,026,000,000   10,026,000,000   10,076,000,000
Recurring | Level 3 | Trading account assets | Interest rate contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 3,535,000,000   3,535,000,000   3,467,000,000
Recurring | Level 3 | Trading account assets | Foreign exchange contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 1,156,000,000   1,156,000,000   1,325,000,000
Recurring | Level 3 | Trading account assets | Equity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 2,056,000,000   2,056,000,000   1,473,000,000
Recurring | Level 3 | Trading account assets | Commodity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 530,000,000   530,000,000   801,000,000
Recurring | Level 3 | Trading account assets | Credit derivatives
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 2,749,000,000   2,749,000,000   3,010,000,000
Recurring | Level 3 | Non-trading derivatives and other financial assets
          
Assets, Fair Value Disclosure [Abstract]          
Other assets, gross 108,000,000   108,000,000   181,000,000
Recurring | Level 3 | Trading securities (excluding trading account derivatives)
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 15,735,000,000   15,735,000,000   15,260,000,000
Recurring | Fair value
          
Assets, Fair Value Disclosure [Abstract]          
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Gross 180,154,000,000   180,154,000,000   176,414,000,000
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting (39,241,000,000) [8]   (39,241,000,000) [8]   (34,933,000,000) [8]
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell 140,913,000,000   140,913,000,000   141,481,000,000
Investments 302,182,000,000   302,182,000,000   291,216,000,000
Loans 4,411,000,000 [7]   4,411,000,000 [7]   5,029,000,000 [7]
Mortgage servicing rights (MSRs) 2,093,000,000   2,093,000,000   2,718,000,000
Total assets, Gross 1,505,417,000,000   1,505,417,000,000   1,519,870,000,000
Total assets, Netting (756,742,000,000) [8]   (756,742,000,000) [8]   (786,375,000,000) [8]
Total assets 748,675,000,000   748,675,000,000   733,495,000,000
Liabilities, Fair Value Disclosure [Abstract]          
Interest-bearing deposits 1,791,000,000   1,791,000,000   1,677,000,000
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Gross 83,879,000,000   83,879,000,000   86,478,000,000
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Netting (39,241,000,000) [8]   (39,241,000,000) [8]   (34,933,000,000) [8]
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase 44,638,000,000   44,638,000,000   51,545,000,000
Securities sold, not yet purchased 78,561,000,000   78,561,000,000   61,508,000,000
Short-term borrowings 1,454,000,000   1,454,000,000   3,692,000,000
Long-term debt, at fair value 26,455,000,000   26,455,000,000   26,877,000,000
Total liabilities, Gross 972,134,000,000   972,134,000,000   982,189,000,000
Total liabilities, Netting (757,799,000,000) [8]   (757,799,000,000) [8]   (787,625,000,000) [8]
Total liabilities 214,335,000,000   214,335,000,000   194,564,000,000
Recurring | Fair value | Trading derivatives liabilities
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 765,441,000,000   765,441,000,000   791,119,000,000
Cash collateral received 11,828,000,000 [9]   11,828,000,000 [9]   8,827,000,000 [10]
Total trading derivatives and cash collateral, liability 777,269,000,000   777,269,000,000   799,946,000,000
Netting agreements (674,769,000,000) [8]   (674,769,000,000) [8]   (713,598,000,000) [8]
Netting of cash collateral paid (43,789,000,000) [8]   (43,789,000,000) [8]   (39,094,000,000) [8]
Netting, Liabilities, total of netting agreements and cash collateral received (718,558,000,000) [8]   (718,558,000,000) [8]   (752,692,000,000) [8]
Total derivative liabilities 58,711,000,000   58,711,000,000   47,254,000,000
Cash collateral received, gross 52,263,000,000   52,263,000,000   43,720,000,000
Recurring | Fair value | Trading derivatives liabilities | Interest rate contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 534,102,000,000   534,102,000,000   617,226,000,000
Recurring | Fair value | Trading derivatives liabilities | Foreign exchange contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 141,663,000,000   141,663,000,000   88,637,000,000
Recurring | Fair value | Trading derivatives liabilities | Equity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 35,441,000,000   35,441,000,000   34,292,000,000
Recurring | Fair value | Trading derivatives liabilities | Commodity contracts
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 13,335,000,000   13,335,000,000   10,170,000,000
Recurring | Fair value | Trading derivatives liabilities | Credit derivatives
          
Liabilities, Fair Value Disclosure [Abstract]          
Trading derivatives, liability 40,900,000,000   40,900,000,000   40,794,000,000
Recurring | Fair value | Non-trading derivatives and other financial liabilities
          
Assets, Fair Value Disclosure [Abstract]          
Netting of cash collateral received (2,297,000,000)   (2,297,000,000)   (2,951,000,000)
Liabilities, Fair Value Disclosure [Abstract]          
Cash collateral received 292,000,000 [11]   292,000,000 [11]   282,000,000 [12]
Other liabilities, gross 2,433,000,000   2,433,000,000   1,729,000,000
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross 2,725,000,000   2,725,000,000   2,011,000,000
Total other assets and cash collateral, gross 2,725,000,000   2,725,000,000   2,011,000,000
Cash collateral received, gross 2,589,000,000   2,589,000,000   3,233,000,000
Recurring | Fair value | Mortgage-backed securities - U.S. agency-sponsored
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 19,779,000,000   19,779,000,000   23,955,000,000
Investments 36,868,000,000   36,868,000,000   41,997,000,000
Recurring | Fair value | Mortgage-backed securities - Residential
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 3,886,000,000   3,886,000,000   4,077,000,000
Investments 9,290,000,000   9,290,000,000   10,205,000,000
Recurring | Fair value | Mortgage-backed securities - Commercial
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,962,000,000   2,962,000,000   2,574,000,000
Investments 564,000,000   564,000,000   453,000,000
Recurring | Fair value | Mortgage-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 26,627,000,000   26,627,000,000   30,606,000,000
Investments 46,722,000,000   46,722,000,000   52,655,000,000
Recurring | Fair value | U.S. Treasury and federal agency securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 21,713,000,000   21,713,000,000   14,837,000,000
Investments 111,886,000,000   111,886,000,000   87,596,000,000
Recurring | Fair value | State and municipal securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 2,713,000,000   2,713,000,000   3,207,000,000
Investments 12,913,000,000   12,913,000,000   18,940,000,000
Recurring | Fair value | Foreign government
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 76,133,000,000   76,133,000,000   74,856,000,000
Investments 95,660,000,000   95,660,000,000   96,471,000,000
Recurring | Fair value | Corporate
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 28,388,000,000   28,388,000,000   30,534,000,000
Investments 13,958,000,000   13,958,000,000   11,130,000,000
Recurring | Fair value | Equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 55,662,000,000   55,662,000,000   61,776,000,000
Investments 3,986,000,000   3,986,000,000   3,734,000,000
Recurring | Fair value | Asset-backed securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 4,653,000,000   4,653,000,000   5,616,000,000
Investments 12,843,000,000   12,843,000,000   15,274,000,000
Recurring | Fair value | Other debt securities
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 17,239,000,000   17,239,000,000   11,675,000,000
Investments 710,000,000   710,000,000   711,000,000
Recurring | Fair value | Non-marketable equity securities
          
Assets, Fair Value Disclosure [Abstract]          
Investments 3,504,000,000   3,504,000,000   4,705,000,000
Recurring | Fair value | Trading account assets
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 769,640,000,000   769,640,000,000   795,239,000,000
Gross cash collateral paid 3,258,000,000 [13]   3,258,000,000 [13]   6,073,000,000 [14]
Trading derivative, asset, gross net cash collateral paid 772,898,000,000   772,898,000,000   801,312,000,000
Less: Netting agreements to assets (674,769,000,000) [8]   (674,769,000,000) [8]   (713,598,000,000) [8]
Netting of cash collateral received (40,435,000,000) [8]   (40,435,000,000) [8]   (34,893,000,000) [8]
Netting, Assets, total of netting agreements and cash collateral received (715,204,000,000) [8]   (715,204,000,000) [8]   (748,491,000,000) [8]
Trading derivatives 57,694,000,000   57,694,000,000   52,821,000,000
Cash collateral paid, gross 47,047,000,000   47,047,000,000   45,167,000,000
Recurring | Fair value | Trading account assets | Interest rate contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 548,967,000,000   548,967,000,000   628,380,000,000
Recurring | Fair value | Trading account assets | Foreign exchange contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 142,542,000,000   142,542,000,000   92,554,000,000
Recurring | Fair value | Trading account assets | Equity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 25,240,000,000   25,240,000,000   24,877,000,000
Recurring | Fair value | Trading account assets | Commodity contracts
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 12,060,000,000   12,060,000,000   9,082,000,000
Recurring | Fair value | Trading account assets | Credit derivatives
          
Assets, Fair Value Disclosure [Abstract]          
Trading derivatives, asset, Gross 40,831,000,000   40,831,000,000   40,346,000,000
Recurring | Fair value | Non-trading derivatives and other financial assets
          
Assets, Fair Value Disclosure [Abstract]          
Netting of cash collateral received (2,297,000,000) [8]   (2,297,000,000) [8]   (2,951,000,000) [8]
Netting, Assets, total of netting agreements and cash collateral received (2,297,000,000) [8]   (2,297,000,000) [8]   (2,951,000,000) [8]
Other assets, gross 10,354,000,000   10,354,000,000   9,992,000,000
Cash collateral paid, gross 197,000,000   197,000,000   82,000,000
Total other assets and cash collateral, gross 10,551,000,000   10,551,000,000   10,074,000,000
Other assets 8,254,000,000   8,254,000,000   7,123,000,000
Recurring | Fair value | Trading securities (excluding trading account derivatives)
          
Assets, Fair Value Disclosure [Abstract]          
Trading securities 233,128,000,000   233,128,000,000   233,107,000,000
Trading account assets and liabilities | Principal transactions | Change in Accounting Method Accounted for as Change in Estimate
          
Assets and Liabilities Measured at Fair Value on a Recurring Basis          
Fair value funding valuation adjustment $ 474,000,000        
[1] Includes financial instruments subject to enforceable master netting agreements that are permitted to be offset under ASC 210-20-45.
[2] The Company invests in mortgage-backed and asset-backed securities. These securitizations are generally considered VIEs. The Company’s maximum exposure to loss from these VIEs is equal to the carrying amount of the securities, which is reflected in the table above. For mortgage-backed and asset-backed securitizations in which the Company has other involvement, see Note 20 to the Consolidated Financial Statements.
[3] Includes investments in unallocated precious metals, as discussed in Note 23 to the Consolidated Financial Statements. Also includes physical commodities accounted for at the lower of cost or fair value.
[4] For the three and nine months ended September 30, 2014, the Company transferred assets of approximately $0.3 billion and $2.1 billion, respectively, from Level 1 to Level 2, primarily related to foreign government securities not traded in active markets during the respective periods and Citi refining its methodology for certain equity contracts to reflect the prevalence of off-exchange trading. During the three and nine months ended September 30, 2014, the Company transferred assets of approximately $0.7 billion and $3.7 billion, respectively, from Level 2 to Level 1, almost all related to foreign government bonds traded with sufficient frequency to constitute a liquid market. During the three months ended September 30, 2014, there were no material transfers of liabilities between Level 1 and Level 2. During the nine months ended September 30, 2014, the Company transferred liabilities of approximately $1.4 billion from Level 1 to Level 2, as Citi refined its methodology for certain equity contracts to reflect the prevalence of off-exchange trading.
[5] For the three and nine months ended September 30, 2013, the Company transferred assets of $47 million and $1.0 billion, respectively, from Level 1 to Level 2. During the three and nine months ended September 30, 2013, the Company transferred assets of approximately $33 million and $49.1 billion, respectively, from Level 2 to Level 1. Almost all of the transfers during the nine months ended September 30, 2013 were related to U.S. Treasury securities held across the Company’s major investment portfolios where Citi obtained additional information from its external pricing sources to meet the criteria for Level 1 classification. There were no material liability transfers between Level 1 and Level 2 during the three and nine months ended September 30, 2013.
[6] Because the amount of the cash collateral paid/received has not been allocated to the Level 1, 2 and 3 subtotals, these percentages are calculated based on total assets and liabilities measured at fair value on a recurring basis, excluding the cash collateral paid/received on derivatives.
[7] There is no allowance for loan losses recorded for loans reported at fair value.
[8] Represents netting of: (i) the amounts due under securities purchased under agreements to resell and the amounts owed under securities sold under agreements to repurchase; and (ii) derivative exposures covered by a qualifying master netting agreement and cash collateral offsetting.
[9] Reflects the net amount of $52,263 million of gross cash collateral received, of which $40,435 million was used to offset derivative assets.
[10] Reflects the net amount of $43,720 million of gross cash collateral received, of which $34,893 million was used to offset derivative assets.
[11] Reflects the net amount of $2,589 million of gross cash collateral received, of which $2,297 million was used to offset derivative assets.
[12] Reflects the net amount of $3,233 million of gross cash collateral received, of which $2,951 million was used to offset derivative assets.
[13] Reflects the net amount of $47,047 million of gross cash collateral paid, of which $43,789 million was used to offset derivative liabilities.
[14] Reflects the net amount of $45,167 million of gross cash collateral paid, of which $39,094 million was used to offset derivative liabilities.