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INVESTMENTS (Details 4) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2011
Reclassification of debt securities from held-to-maturity to trading account assets
Dec. 31, 2011
Reclassification of debt securities from held-to-maturity to trading account assets
Dec. 31, 2012
Mortgage-backed securities
Dec. 31, 2011
Mortgage-backed securities
Dec. 31, 2012
Prime
Dec. 31, 2011
Prime
Dec. 31, 2012
Alt-A
Dec. 31, 2011
Alt-A
Dec. 31, 2012
Subprime
Dec. 31, 2011
Subprime
Dec. 31, 2012
Non-U.S. residential
Dec. 31, 2011
Non-U.S. residential
Dec. 31, 2012
Commercial
Dec. 31, 2011
Commercial
Dec. 31, 2012
State and municipal securities
Dec. 31, 2011
State and municipal securities
Dec. 31, 2012
Foreign government
Dec. 31, 2012
Foreign government
Held-to-maturity
Dec. 31, 2012
Corporate
Dec. 31, 2011
Corporate
Dec. 31, 2012
Asset-backed securities
Dec. 31, 2011
Asset-backed securities
Schedule of Held-to-maturity Securities                                                  
Investment reclassified from investments held-to-maturity to trading account assets       $ 10,000,000,000                                          
Investment reclassified from investments held-to-maturity to trading account assets subsequently sold substantially         12,700,000,000                                        
Investments held-to-maturity sold 2,110,000,000 1,612,000,000 413,000,000 2,700,000,000                                          
Net pretax loss recognized in the consolidated statement of income 187,000,000 299,000,000 49,000,000 709,000,000                                          
After tax loss recognized in the consolidated statement of income       427,000,000                                          
Gross unrealized gains included in other revenue       311,000,000                                          
Gross unrealized losses included in other-than-temporary-impairment losses on investments       1,387,000,000                                          
Net realized gains included in realized gains (losses) on sales of investments       367,000,000                                          
After tax unrealized losses reflected in AOCI       1,012,000,000                                          
Debt Securities Held-to-maturity                                                  
Amortized cost 11,662,000,000 13,759,000,000       6,039,000,000 9,475,000,000 258,000,000 360,000,000 2,969,000,000 4,732,000,000 201,000,000 383,000,000 2,488,000,000 3,487,000,000 123,000,000 513,000,000 1,278,000,000 1,422,000,000 2,987,000,000   829,000,000 1,862,000,000 529,000,000 1,000,000,000
Net unrealized loss recognized in AOCI 1,532,000,000 2,276,000,000   1,656,000,000   1,330,000,000 2,045,000,000 49,000,000 73,000,000 837,000,000 1,404,000,000 43,000,000 47,000,000 401,000,000 520,000,000   1,000,000 73,000,000 95,000,000     103,000,000 113,000,000 26,000,000 23,000,000
Carrying value 10,130,000,000 11,483,000,000       4,709,000,000 7,430,000,000 209,000,000 287,000,000 2,132,000,000 3,328,000,000 158,000,000 336,000,000 2,087,000,000 2,967,000,000 123,000,000 512,000,000 1,205,000,000 1,327,000,000 2,987,000,000   726,000,000 1,749,000,000 503,000,000 977,000,000
Gross unrecognized gains 917,000,000 182,000,000       747,000,000 105,000,000 30,000,000 21,000,000 653,000,000 20,000,000 13,000,000 1,000,000 50,000,000 59,000,000 1,000,000 4,000,000 89,000,000 68,000,000     73,000,000   8,000,000 9,000,000
Gross unrecognized losses 403,000,000 1,165,000,000       358,000,000 752,000,000 4,000,000 20,000,000 250,000,000 319,000,000 21,000,000 71,000,000 81,000,000 290,000,000 2,000,000 52,000,000 37,000,000 72,000,000       254,000,000 8,000,000 87,000,000
Fair value 10,644,000,000 10,500,000,000       5,098,000,000 6,783,000,000 235,000,000 288,000,000 2,535,000,000 3,029,000,000 150,000,000 266,000,000 2,056,000,000 2,736,000,000 122,000,000 464,000,000 1,257,000,000 1,323,000,000 2,987,000,000   799,000,000 1,495,000,000 503,000,000 899,000,000
Mexican Government bonds purchased                                         $ 2,600,000,000