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FAIR VALUE MEASUREMENT (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2008
D
Jun. 30, 2012
Dec. 31, 2011
Feb. 29, 2008
Jun. 30, 2012
Maximum
score
Jun. 30, 2012
Minimum
score
Jun. 30, 2012
Recurring
Foreign government
Jun. 30, 2012
Recurring
Foreign government
Jun. 30, 2012
Recurring
Equity securities
Jun. 30, 2012
Recurring
Equity securities
Jun. 30, 2012
Recurring
Equity securities
Equity contracts
Jun. 30, 2012
Recurring
Equity securities
Equity contracts
Jun. 30, 2012
Recurring
Level 1
Dec. 31, 2011
Recurring
Level 1
Jun. 30, 2012
Recurring
Level 1
Interest rate contracts
Dec. 31, 2011
Recurring
Level 1
Interest rate contracts
Jun. 30, 2012
Recurring
Level 1
Foreign exchange contracts
Jun. 30, 2012
Recurring
Level 1
Equity contracts
Dec. 31, 2011
Recurring
Level 1
Equity contracts
Jun. 30, 2012
Recurring
Level 1
Commodity contracts
Dec. 31, 2011
Recurring
Level 1
Commodity contracts
Jun. 30, 2012
Recurring
Level 1
Mortgage-backed securities
Dec. 31, 2011
Recurring
Level 1
Mortgage-backed securities
Jun. 30, 2012
Recurring
Level 1
U.S. government-sponsored agency guaranteed
Dec. 31, 2011
Recurring
Level 1
U.S. government-sponsored agency guaranteed
Jun. 30, 2012
Recurring
Level 1
U.S. Treasury and federal agency securities
Dec. 31, 2011
Recurring
Level 1
U.S. Treasury and federal agency securities
Jun. 30, 2012
Recurring
Level 1
U.S. Treasury
Dec. 31, 2011
Recurring
Level 1
U.S. Treasury
Jun. 30, 2012
Recurring
Level 1
Foreign government
Dec. 31, 2011
Recurring
Level 1
Foreign government
Jun. 30, 2012
Recurring
Level 1
Equity securities
Dec. 31, 2011
Recurring
Level 1
Equity securities
Jun. 30, 2012
Recurring
Level 2
Dec. 31, 2011
Recurring
Level 2
Jun. 30, 2012
Recurring
Level 2
Interest rate contracts
Dec. 31, 2011
Recurring
Level 2
Interest rate contracts
Jun. 30, 2012
Recurring
Level 2
Foreign exchange contracts
Dec. 31, 2011
Recurring
Level 2
Foreign exchange contracts
Jun. 30, 2012
Recurring
Level 2
Equity contracts
Dec. 31, 2011
Recurring
Level 2
Equity contracts
Jun. 30, 2012
Recurring
Level 2
Commodity contracts
Dec. 31, 2011
Recurring
Level 2
Commodity contracts
Jun. 30, 2012
Recurring
Level 2
Credit derivatives
Dec. 31, 2011
Recurring
Level 2
Credit derivatives
Jun. 30, 2012
Recurring
Level 2
Mortgage-backed securities
Dec. 31, 2011
Recurring
Level 2
Mortgage-backed securities
Jun. 30, 2012
Recurring
Level 2
U.S. government-sponsored agency guaranteed
Dec. 31, 2011
Recurring
Level 2
U.S. government-sponsored agency guaranteed
Jun. 30, 2012
Recurring
Level 2
Prime
Dec. 31, 2011
Recurring
Level 2
Prime
Jun. 30, 2012
Recurring
Level 2
Alt-A
Dec. 31, 2011
Recurring
Level 2
Alt-A
Jun. 30, 2012
Recurring
Level 2
Subprime
Dec. 31, 2011
Recurring
Level 2
Subprime
Jun. 30, 2012
Recurring
Level 2
Non-U.S. residential
Dec. 31, 2011
Recurring
Level 2
Non-U.S. residential
Jun. 30, 2012
Recurring
Level 2
Commercial
Dec. 31, 2011
Recurring
Level 2
Commercial
Jun. 30, 2012
Recurring
Level 2
U.S. Treasury and federal agency securities
Dec. 31, 2011
Recurring
Level 2
U.S. Treasury and federal agency securities
Jun. 30, 2012
Recurring
Level 2
U.S. Treasury
Dec. 31, 2011
Recurring
Level 2
U.S. Treasury
Jun. 30, 2012
Recurring
Level 2
Agency obligations
Dec. 31, 2011
Recurring
Level 2
Agency obligations
Jun. 30, 2012
Recurring
Level 2
State and municipal securities
Dec. 31, 2011
Recurring
Level 2
State and municipal securities
Jun. 30, 2012
Recurring
Level 2
Foreign government
Dec. 31, 2011
Recurring
Level 2
Foreign government
Jun. 30, 2012
Recurring
Level 2
Corporate
Dec. 31, 2011
Recurring
Level 2
Corporate
Jun. 30, 2012
Recurring
Level 2
Equity securities
Dec. 31, 2011
Recurring
Level 2
Equity securities
Jun. 30, 2012
Recurring
Level 2
Asset-backed securities
Dec. 31, 2011
Recurring
Level 2
Asset-backed securities
Jun. 30, 2012
Recurring
Level 2
Other debt securities
Dec. 31, 2011
Recurring
Level 2
Other debt securities
Jun. 30, 2012
Recurring
Level 2
Non-marketable equity securities
Dec. 31, 2011
Recurring
Level 2
Non-marketable equity securities
Jun. 30, 2012
Recurring
Level 3
Dec. 31, 2011
Recurring
Level 3
Jun. 30, 2012
Recurring
Level 3
Interest rate contracts
Dec. 31, 2011
Recurring
Level 3
Interest rate contracts
Jun. 30, 2012
Recurring
Level 3
Foreign exchange contracts
Dec. 31, 2011
Recurring
Level 3
Foreign exchange contracts
Jun. 30, 2012
Recurring
Level 3
Equity contracts
Dec. 31, 2011
Recurring
Level 3
Equity contracts
Jun. 30, 2012
Recurring
Level 3
Commodity contracts
Dec. 31, 2011
Recurring
Level 3
Commodity contracts
Jun. 30, 2012
Recurring
Level 3
Credit derivatives
Dec. 31, 2011
Recurring
Level 3
Credit derivatives
Jun. 30, 2012
Recurring
Level 3
Mortgage-backed securities
Dec. 31, 2011
Recurring
Level 3
Mortgage-backed securities
Jun. 30, 2012
Recurring
Level 3
U.S. government-sponsored agency guaranteed
Dec. 31, 2011
Recurring
Level 3
U.S. government-sponsored agency guaranteed
Jun. 30, 2012
Recurring
Level 3
Prime
Dec. 31, 2011
Recurring
Level 3
Prime
Jun. 30, 2012
Recurring
Level 3
Alt-A
Dec. 31, 2011
Recurring
Level 3
Alt-A
Jun. 30, 2012
Recurring
Level 3
Subprime
Dec. 31, 2011
Recurring
Level 3
Subprime
Jun. 30, 2012
Recurring
Level 3
Non-U.S. residential
Dec. 31, 2011
Recurring
Level 3
Non-U.S. residential
Jun. 30, 2012
Recurring
Level 3
Commercial
Dec. 31, 2011
Recurring
Level 3
Commercial
Jun. 30, 2012
Recurring
Level 3
U.S. Treasury and federal agency securities
Dec. 31, 2011
Recurring
Level 3
U.S. Treasury and federal agency securities
Jun. 30, 2012
Recurring
Level 3
Agency obligations
Dec. 31, 2011
Recurring
Level 3
Agency obligations
Jun. 30, 2012
Recurring
Level 3
State and municipal securities
Dec. 31, 2011
Recurring
Level 3
State and municipal securities
Jun. 30, 2012
Recurring
Level 3
Foreign government
Dec. 31, 2011
Recurring
Level 3
Foreign government
Jun. 30, 2012
Recurring
Level 3
Corporate
Dec. 31, 2011
Recurring
Level 3
Corporate
Jun. 30, 2012
Recurring
Level 3
Equity securities
Dec. 31, 2011
Recurring
Level 3
Equity securities
Jun. 30, 2012
Recurring
Level 3
Asset-backed securities
Dec. 31, 2011
Recurring
Level 3
Asset-backed securities
Jun. 30, 2012
Recurring
Level 3
Other debt securities
Dec. 31, 2011
Recurring
Level 3
Other debt securities
Jun. 30, 2012
Recurring
Level 3
Non-marketable equity securities
Dec. 31, 2011
Recurring
Level 3
Non-marketable equity securities
Jun. 30, 2012
Recurring
Gross inventory
Dec. 31, 2011
Recurring
Gross inventory
Jun. 30, 2012
Recurring
Gross inventory
Interest rate contracts
Dec. 31, 2011
Recurring
Gross inventory
Interest rate contracts
Jun. 30, 2012
Recurring
Gross inventory
Foreign exchange contracts
Dec. 31, 2011
Recurring
Gross inventory
Foreign exchange contracts
Jun. 30, 2012
Recurring
Gross inventory
Equity contracts
Dec. 31, 2011
Recurring
Gross inventory
Equity contracts
Jun. 30, 2012
Recurring
Gross inventory
Commodity contracts
Dec. 31, 2011
Recurring
Gross inventory
Commodity contracts
Jun. 30, 2012
Recurring
Gross inventory
Credit derivatives
Dec. 31, 2011
Recurring
Gross inventory
Credit derivatives
Jun. 30, 2012
Recurring
Gross inventory
Mortgage-backed securities
Dec. 31, 2011
Recurring
Gross inventory
Mortgage-backed securities
Jun. 30, 2012
Recurring
Gross inventory
U.S. government-sponsored agency guaranteed
Dec. 31, 2011
Recurring
Gross inventory
U.S. government-sponsored agency guaranteed
Jun. 30, 2012
Recurring
Gross inventory
Prime
Dec. 31, 2011
Recurring
Gross inventory
Prime
Jun. 30, 2012
Recurring
Gross inventory
Alt-A
Dec. 31, 2011
Recurring
Gross inventory
Alt-A
Jun. 30, 2012
Recurring
Gross inventory
Subprime
Dec. 31, 2011
Recurring
Gross inventory
Subprime
Jun. 30, 2012
Recurring
Gross inventory
Non-U.S. residential
Dec. 31, 2011
Recurring
Gross inventory
Non-U.S. residential
Jun. 30, 2012
Recurring
Gross inventory
Commercial
Dec. 31, 2011
Recurring
Gross inventory
Commercial
Jun. 30, 2012
Recurring
Gross inventory
U.S. Treasury and federal agency securities
Dec. 31, 2011
Recurring
Gross inventory
U.S. Treasury and federal agency securities
Jun. 30, 2012
Recurring
Gross inventory
U.S. Treasury
Dec. 31, 2011
Recurring
Gross inventory
U.S. Treasury
Jun. 30, 2012
Recurring
Gross inventory
Agency obligations
Dec. 31, 2011
Recurring
Gross inventory
Agency obligations
Jun. 30, 2012
Recurring
Gross inventory
State and municipal securities
Dec. 31, 2011
Recurring
Gross inventory
State and municipal securities
Jun. 30, 2012
Recurring
Gross inventory
Foreign government
Dec. 31, 2011
Recurring
Gross inventory
Foreign government
Jun. 30, 2012
Recurring
Gross inventory
Corporate
Dec. 31, 2011
Recurring
Gross inventory
Corporate
Jun. 30, 2012
Recurring
Gross inventory
Equity securities
Dec. 31, 2011
Recurring
Gross inventory
Equity securities
Jun. 30, 2012
Recurring
Gross inventory
Asset-backed securities
Dec. 31, 2011
Recurring
Gross inventory
Asset-backed securities
Jun. 30, 2012
Recurring
Gross inventory
Other debt securities
Dec. 31, 2011
Recurring
Gross inventory
Other debt securities
Jun. 30, 2012
Recurring
Gross inventory
Non-marketable equity securities
Dec. 31, 2011
Recurring
Gross inventory
Non-marketable equity securities
Jun. 30, 2012
Recurring
Netting
Dec. 31, 2011
Recurring
Netting
Jun. 30, 2012
Recurring
Fair value
Dec. 31, 2011
Recurring
Fair value
Jun. 30, 2012
Recurring
Fair value
Mortgage-backed securities
Dec. 31, 2011
Recurring
Fair value
Mortgage-backed securities
Jun. 30, 2012
Recurring
Fair value
U.S. government-sponsored agency guaranteed
Dec. 31, 2011
Recurring
Fair value
U.S. government-sponsored agency guaranteed
Jun. 30, 2012
Recurring
Fair value
Prime
Dec. 31, 2011
Recurring
Fair value
Prime
Jun. 30, 2012
Recurring
Fair value
Alt-A
Dec. 31, 2011
Recurring
Fair value
Alt-A
Jun. 30, 2012
Recurring
Fair value
Subprime
Dec. 31, 2011
Recurring
Fair value
Subprime
Jun. 30, 2012
Recurring
Fair value
Non-U.S. residential
Dec. 31, 2011
Recurring
Fair value
Non-U.S. residential
Jun. 30, 2012
Recurring
Fair value
Commercial
Dec. 31, 2011
Recurring
Fair value
Commercial
Jun. 30, 2012
Recurring
Fair value
U.S. Treasury and federal agency securities
Dec. 31, 2011
Recurring
Fair value
U.S. Treasury and federal agency securities
Jun. 30, 2012
Recurring
Fair value
U.S. Treasury
Dec. 31, 2011
Recurring
Fair value
U.S. Treasury
Jun. 30, 2012
Recurring
Fair value
Agency obligations
Dec. 31, 2011
Recurring
Fair value
Agency obligations
Jun. 30, 2012
Recurring
Fair value
State and municipal securities
Dec. 31, 2011
Recurring
Fair value
State and municipal securities
Jun. 30, 2012
Recurring
Fair value
Foreign government
Dec. 31, 2011
Recurring
Fair value
Foreign government
Jun. 30, 2012
Recurring
Fair value
Corporate
Dec. 31, 2011
Recurring
Fair value
Corporate
Jun. 30, 2012
Recurring
Fair value
Equity securities
Dec. 31, 2011
Recurring
Fair value
Equity securities
Jun. 30, 2012
Recurring
Fair value
Asset-backed securities
Dec. 31, 2011
Recurring
Fair value
Asset-backed securities
Jun. 30, 2012
Recurring
Fair value
Other debt securities
Dec. 31, 2011
Recurring
Fair value
Other debt securities
Jun. 30, 2012
Recurring
Fair value
Non-marketable equity securities
Dec. 31, 2011
Recurring
Fair value
Non-marketable equity securities
FAIR VALUE MEASUREMENT                                                                                                                                                                                                                                                                                                                                                                                                                              
Amount of auction rate securities in which Citigroup acted in the capacity of primary dealer   $ 11,000,000,000   $ 72,000,000,000                                                                                                                                                                                                                                                                                                                                                                                                                      
Maturity period of auction rate securities, period one (in days) 7                                                                                                                                                                                                                                                                                                                                                                                                                            
Maturity period of auction rate securities, period two (in days) 28                                                                                                                                                                                                                                                                                                                                                                                                                            
Maturity period of auction rate securities, period three (in days) 35                                                                                                                                                                                                                                                                                                                                                                                                                            
Residential mortgage-backed securities (RMBS) where collateral is composed of full documentation loans, above the high end of range (as a percent)   30.00%                                                                                                                                                                                                                                                                                                                                                                                                                          
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         720 680                                                                                                                                                                                                                                                                                                                                                                                                                  
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell and securities borrowed   167,973,000,000 142,862,000,000                                                             200,787,000,000 188,034,000,000                                                                                         4,414,000,000 4,701,000,000                                                                                     205,201,000,000 192,735,000,000                                                                                         (37,228,000,000) (49,873,000,000) 167,973,000,000 142,862,000,000                                                                    
Trading securities                         113,879,000,000 97,748,000,000                       18,171,000,000 15,612,000,000 18,171,000,000 15,612,000,000 55,607,000,000 52,429,000,000 40,101,000,000 29,707,000,000 122,259,000,000 115,867,000,000                     33,088,000,000 29,751,000,000 29,852,000,000 26,674,000,000 245,000,000 118,000,000 552,000,000 444,000,000 301,000,000 524,000,000 288,000,000 276,000,000 1,850,000,000 1,715,000,000 4,600,000,000 3,784,000,000 2,065,000,000 2,615,000,000 2,535,000,000 1,169,000,000 6,426,000,000 5,112,000,000 28,217,000,000 26,601,000,000 32,709,000,000 33,786,000,000 1,932,000,000 3,279,000,000 1,110,000,000 1,270,000,000 14,177,000,000 12,284,000,000     13,332,000,000 15,792,000,000                     3,256,000,000 2,988,000,000 895,000,000 861,000,000 1,069,000,000 759,000,000 273,000,000 165,000,000 487,000,000 465,000,000 116,000,000 120,000,000 416,000,000 618,000,000 13,000,000 3,000,000 13,000,000 3,000,000 223,000,000 252,000,000 333,000,000 521,000,000 2,189,000,000 3,240,000,000 217,000,000 244,000,000 4,835,000,000 5,801,000,000 2,266,000,000 2,743,000,000     249,470,000,000 229,407,000,000                     36,344,000,000 32,739,000,000 30,747,000,000 27,535,000,000 1,314,000,000 877,000,000 825,000,000 609,000,000 788,000,000 989,000,000 404,000,000 396,000,000 2,266,000,000 2,333,000,000 22,784,000,000 19,399,000,000 20,236,000,000 18,227,000,000 2,548,000,000 1,172,000,000 6,649,000,000 5,364,000,000 84,157,000,000 79,551,000,000 34,898,000,000 37,026,000,000 42,250,000,000 33,230,000,000 5,945,000,000 7,071,000,000 16,443,000,000 15,027,000,000         249,470,000,000 229,407,000,000 36,344,000,000 32,739,000,000 30,747,000,000 27,535,000,000 1,314,000,000 877,000,000 825,000,000 609,000,000 788,000,000 989,000,000 404,000,000 396,000,000 2,266,000,000 2,333,000,000 22,784,000,000 19,399,000,000 20,236,000,000 18,227,000,000 2,548,000,000 1,172,000,000 6,649,000,000 5,364,000,000 84,157,000,000 79,551,000,000 34,898,000,000 37,026,000,000 42,250,000,000 33,230,000,000 5,945,000,000 7,071,000,000 16,443,000,000 15,027,000,000    
Total Gross Derivatives, Assets                         3,905,000,000 3,265,000,000 2,000,000 67,000,000 10,000,000 3,068,000,000 2,240,000,000 825,000,000 958,000,000                         1,007,197,000,000 958,448,000,000 833,094,000,000 755,473,000,000 80,133,000,000 93,536,000,000 15,838,000,000 16,376,000,000 11,873,000,000 11,940,000,000 66,259,000,000 81,123,000,000                                                                     11,191,000,000 14,513,000,000 1,974,000,000 1,947,000,000 908,000,000 781,000,000 1,348,000,000 1,619,000,000 790,000,000 865,000,000 6,171,000,000 9,301,000,000                                                                 1,022,293,000,000 976,226,000,000 835,070,000,000 757,487,000,000 81,051,000,000 94,317,000,000 20,254,000,000 20,235,000,000 13,488,000,000 13,763,000,000 72,430,000,000 90,424,000,000                                                                                                                                                
Gross cash collateral paid                                                                                                                                                                                                                                                       57,740,000,000 57,815,000,000                                                                                                                                                                    
Less: Netting agreements and market value adjustments to assets                                                                                                                                                                                                                                                                                                                                                   (1,019,257,000,000) (971,714,000,000)                                                                        
Total derivatives, assets                         3,905,000,000 3,265,000,000                                       1,007,197,000,000 958,448,000,000                                                                                         11,191,000,000 14,513,000,000                                                                                     1,080,033,000,000 1,034,041,000,000                                                                                         (1,019,257,000,000) (971,714,000,000) 60,776,000,000 62,327,000,000                                                                    
Investments   286,333,000,000 274,040,000,000                   52,849,000,000 51,879,000,000               52,000,000 59,000,000 52,000,000 59,000,000 14,208,000,000 11,642,000,000 14,208,000,000 11,642,000,000 36,209,000,000 33,544,000,000 2,380,000,000 6,634,000,000 220,255,000,000 205,364,000,000                     51,614,000,000 50,279,000,000 44,482,000,000 45,043,000,000 104,000,000 105,000,000 14,000,000 1,000,000     6,523,000,000 4,658,000,000 491,000,000 472,000,000 75,264,000,000 73,421,000,000 42,775,000,000 38,587,000,000 32,489,000,000 34,834,000,000 16,233,000,000 13,732,000,000 59,034,000,000 50,523,000,000 8,940,000,000 9,268,000,000 73,000,000 98,000,000 8,628,000,000 6,962,000,000   563,000,000 469,000,000 518,000,000 13,229,000,000 16,797,000,000                     1,715,000,000 687,000,000 1,399,000,000 679,000,000 2,000,000 8,000,000 3,000,000   6,000,000   300,000,000   5,000,000     75,000,000   75,000,000 480,000,000 667,000,000 329,000,000 447,000,000 421,000,000 989,000,000 1,180,000,000 1,453,000,000 2,771,000,000 4,041,000,000 55,000,000 120,000,000 6,278,000,000 8,318,000,000 286,333,000,000 274,040,000,000                     53,381,000,000 51,025,000,000 45,933,000,000 45,781,000,000 106,000,000 113,000,000 17,000,000 1,000,000 6,000,000   6,823,000,000 4,658,000,000 496,000,000 472,000,000 89,472,000,000 85,138,000,000 56,983,000,000 50,229,000,000 32,489,000,000 34,909,000,000 16,713,000,000 14,399,000,000 95,572,000,000 84,514,000,000 9,361,000,000 10,257,000,000 3,633,000,000 8,185,000,000 11,399,000,000 11,003,000,000 55,000,000 683,000,000 6,747,000,000 8,836,000,000     286,333,000,000 274,040,000,000 53,381,000,000 51,025,000,000 45,933,000,000 45,781,000,000 106,000,000 113,000,000 17,000,000 1,000,000 6,000,000   6,823,000,000 4,658,000,000 496,000,000 472,000,000 89,472,000,000 85,138,000,000 56,983,000,000 50,229,000,000 32,489,000,000 34,909,000,000 16,713,000,000 14,399,000,000 95,572,000,000 84,514,000,000 9,361,000,000 10,257,000,000 3,633,000,000 8,185,000,000 11,399,000,000 11,003,000,000 55,000,000 683,000,000 6,747,000,000 8,836,000,000
Loans   5,089,000,000 5,265,000,000                                                             352,000,000 583,000,000                                                                                         4,737,000,000 4,682,000,000                                                                                     5,089,000,000 5,265,000,000                                                                                             5,089,000,000 5,265,000,000                                                                    
Mortgage servicing rights (MSRs)                                                                                                                                                               2,117,000,000 2,569,000,000                                                                                     2,117,000,000 2,569,000,000                                                                                             2,117,000,000 2,569,000,000                                                                    
Nontrading derivatives and other financial assets measured on a recurring basis, gross                                                                   12,599,000,000 14,270,000,000                                                                                         2,375,000,000 2,245,000,000                                                                                     14,974,000,000 16,515,000,000                                                                                                                                                                    
Gross cash collateral paid                                                                                                                                                                                                                                                       238,000,000 307,000,000                                                                                                                                                                    
Netting agreements and market value adjustments                                                                                                                                                                                                                                                                                                                                                   (3,345,000,000) (3,462,000,000)                                                                        
Nontrading derivatives and other financial assets measured on a recurring basis   11,867,000,000 13,360,000,000                                                             12,599,000,000 14,270,000,000                                                                                         2,375,000,000 2,245,000,000                                                                                     15,212,000,000 16,822,000,000                                                                                         (3,345,000,000) (3,462,000,000) 11,867,000,000 13,360,000,000                                                                    
Total assets                         170,633,000,000 152,892,000,000                                       1,563,449,000,000 1,482,566,000,000                                                                                         51,395,000,000 61,299,000,000                                                                                     1,843,455,000,000 1,754,879,000,000                                                                                         (1,059,830,000,000) (1,025,049,000,000) 783,625,000,000 729,830,000,000                                                                    
Total as a percentage of gross assets                         9.60% 9.00%                                       87.50% 87.40%                                                                                         2.90% 3.60%                                                                                     100.00% 100.00%                                                                                                                                                                    
Interest-bearing deposits                                                                   717,000,000 895,000,000                                                                                         698,000,000 431,000,000                                                                                     1,415,000,000 1,326,000,000                                                                                             1,415,000,000 1,326,000,000                                                                    
Federal funds purchased and securities loaned or sold under agreements to repurchase   132,637,000,000 112,770,000,000                                                             168,820,000,000 161,582,000,000                                                                                         1,045,000,000 1,061,000,000                                                                                     169,865,000,000 162,643,000,000                                                                                         (37,228,000,000) (49,873,000,000) 132,637,000,000 112,770,000,000                                                                    
Securities sold, not yet purchased                         61,680,000,000 58,456,000,000                                       8,731,000,000 10,941,000,000                                                                                         148,000,000 412,000,000                                                                                     70,559,000,000 69,809,000,000                                                                                             70,559,000,000 69,809,000,000                                                                    
Total Gross Derivatives, Liabilities                         4,401,000,000 3,732,000,000 1,000,000 37,000,000   3,394,000,000 2,822,000,000 1,006,000,000 873,000,000                         1,004,186,000,000 951,455,000,000 815,810,000,000 738,833,000,000 85,838,000,000 96,549,000,000 27,007,000,000 26,961,000,000 12,303,000,000 11,959,000,000 63,228,000,000 77,153,000,000                                                                     12,761,000,000 14,763,000,000 1,355,000,000 1,221,000,000 906,000,000 814,000,000 2,935,000,000 3,356,000,000 1,692,000,000 1,799,000,000 5,873,000,000 7,573,000,000                                                                 1,021,348,000,000 969,950,000,000 817,166,000,000 740,091,000,000 86,744,000,000 97,363,000,000 33,336,000,000 33,139,000,000 15,001,000,000 14,631,000,000 69,101,000,000 84,726,000,000                                                                                                                                                
Gross cash collateral received                                                                                                                                                                                                                                                       51,431,000,000 52,811,000,000                                                                                                                                                                    
Netting agreements and market value adjustments to liabilities                                                                                                                                                                                                                                                                                                                                                   (1,014,520,000,000) (966,488,000,000)                                                                        
Total derivatives, liabilities                         4,401,000,000 3,732,000,000                                       1,004,186,000,000 951,455,000,000                                                                                         12,761,000,000 14,763,000,000                                                                                     1,072,779,000,000 1,022,761,000,000                                                                                         (1,014,520,000,000) (966,488,000,000) 58,259,000,000 56,273,000,000                                                                    
Short-term borrowings   1,043,000,000 1,354,000,000                                                             676,000,000 855,000,000                                                                                         367,000,000 499,000,000                                                                                     1,043,000,000 1,354,000,000                                                                                             1,043,000,000 1,354,000,000                                                                    
Long-term debt, at fair value   26,517,000,000 24,172,000,000                                                             20,565,000,000 17,268,000,000                                                                                         5,952,000,000 6,904,000,000                                                                                     26,517,000,000 24,172,000,000                                                                                             26,517,000,000 24,172,000,000                                                                    
Nontrading derivatives and other financial liabilities measured on a recurring basis, gross   3,790,000,000 3,742,000,000                                                             3,191,000,000 3,559,000,000                                                                                         2,000,000 3,000,000                                                                                     3,193,000,000 3,562,000,000                                                                                                                                                                    
Gross cash collateral received                                                                                                                                                                                                                                                       3,942,000,000 3,642,000,000                                                                                                                                                                    
Netting agreements and market value adjustments                                                                                                                                                                                                                                                                                                                                                   (3,345,000,000) (3,462,000,000)                                                                        
Nontrading derivatives and other financial liabilities measured on a recurring basis                                                                   3,191,000,000 3,559,000,000                                                                                         2,000,000 3,000,000                                                                                     7,135,000,000 7,204,000,000                                                                                         (3,345,000,000) (3,462,000,000) 3,790,000,000 3,742,000,000                                                                    
Total liabilities                         66,081,000,000 62,188,000,000                                       1,206,886,000,000 1,146,555,000,000                                                                                         20,973,000,000 24,073,000,000                                                                                     1,349,313,000,000 1,289,269,000,000                                                                                         (1,055,093,000,000) (1,019,823,000,000) 294,220,000,000 269,446,000,000                                                                    
Total as a percentage of gross liabilities                         5.10% 5.00%                                       93.30% 93.00%                                                                                         1.60% 2.00%                                                                                     100.00% 100.00%                                                                                                                                                                    
Transfers of assests from Level 2 to Level 1                     46,000,000 400,000,000                                                                                                                                                                                                                                                                                                                                                                                                      
Transfers of assests from Level 1 to Level 2             1,000,000,000 1,000,000,000                                                                                                                                                                                                                                                                                                                                                                                                              
Transfers of liabilities from Level 1 to Level 2                 18,000,000 19,000,000                                                                                                                                                                                                                                                                                                                                                                                                          
Transfers of liabilities from Level 2 to Level 1                 $ 28,000,000 $ 36,000,000