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INVESTMENTS (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investments summary    
Securities available-for-sale, at fair value $ 277,378 $ 288,695
Debt securities held-to-maturity 9,602 10,130
Non-marketable equity securities carried at fair value 5,720 5,768
Non-marketable equity securities carried at cost 7,640 7,733
Total investments 300,340 312,326
Securities available-for-sale    
Fair value 277,378 288,695
Unrealized gains from impact of minority investments and the related allocations and pick up of unrealized gains and losses of AFS securities 76 32
Mortgage-backed securities
   
Investments summary    
Securities available-for-sale, at fair value 58,798 55,471
Debt securities held-to-maturity 2,875 4,709
Securities available-for-sale    
Amortized cost 58,723 53,965
Gross unrealized gains 794 1,672
Gross unrealized losses 719 166
Fair value 58,798 55,471
U.S. government-sponsored agency guaranteed
   
Investments summary    
Securities available-for-sale, at fair value 49,408 47,345
Securities available-for-sale    
Amortized cost 49,450 46,001
Gross unrealized gains 663 1,507
Gross unrealized losses 705 163
Fair value 49,408 47,345
Prime
   
Investments summary    
Securities available-for-sale, at fair value 30 86
Debt securities held-to-maturity 106 209
Securities available-for-sale    
Amortized cost 30 85
Gross unrealized gains   1
Fair value 30 86
Alt-A
   
Investments summary    
Securities available-for-sale, at fair value 1 1
Debt securities held-to-maturity 1,329 2,132
Securities available-for-sale    
Amortized cost 1 1
Fair value 1 1
Non-U.S. residential
   
Investments summary    
Securities available-for-sale, at fair value 8,907 7,590
Debt securities held-to-maturity 1,396 2,087
Securities available-for-sale    
Amortized cost 8,791 7,442
Gross unrealized gains 121 148
Gross unrealized losses 5  
Fair value 8,907 7,590
Commercial
   
Investments summary    
Securities available-for-sale, at fair value 452 449
Debt securities held-to-maturity 27 123
Securities available-for-sale    
Amortized cost 451 436
Gross unrealized gains 10 16
Gross unrealized losses 9 3
Fair value 452 449
U.S. Treasury and federal agency securities
   
Investments summary    
Securities available-for-sale, at fair value 84,562 91,841
Securities available-for-sale    
Amortized cost 84,077 90,681
Gross unrealized gains 714 1,180
Gross unrealized losses 229 20
Fair value 84,562 91,841
U.S. Treasury
   
Investments summary    
Securities available-for-sale, at fair value 63,252 65,594
Securities available-for-sale    
Amortized cost 62,813 64,667
Gross unrealized gains 577 943
Gross unrealized losses 138 16
Fair value 63,252 65,594
Agency obligations
   
Investments summary    
Securities available-for-sale, at fair value 21,310 26,247
Securities available-for-sale    
Amortized cost 21,264 26,014
Gross unrealized gains 137 237
Gross unrealized losses 91 4
Fair value 21,310 26,247
State and municipal securities
   
Investments summary    
Securities available-for-sale, at fair value 17,329 18,332
Debt securities held-to-maturity 1,238 1,205
Securities available-for-sale    
Amortized cost 19,185 20,020
Gross unrealized gains 83 132
Gross unrealized losses 1,939 1,820
Fair value 17,329 18,332
Foreign government
   
Investments summary    
Securities available-for-sale, at fair value 86,307 94,047
Debt securities held-to-maturity 4,123 2,987
Securities available-for-sale    
Amortized cost 86,351 93,298
Gross unrealized gains 464 903
Gross unrealized losses 508 154
Fair value 86,307 94,047
Corporate
   
Investments summary    
Securities available-for-sale, at fair value 10,350 9,674
Debt securities held-to-maturity 734 726
Securities available-for-sale    
Amortized cost 10,194 9,302
Gross unrealized gains 262 398
Gross unrealized losses 106 26
Fair value 10,350 9,674
Asset-backed securities
   
Investments summary    
Securities available-for-sale, at fair value 15,884 14,130
Debt securities held-to-maturity 632 503
Securities available-for-sale    
Amortized cost 15,951 14,188
Gross unrealized gains 54 85
Gross unrealized losses 121 143
Fair value 15,884 14,130
Other debt securities
   
Investments summary    
Securities available-for-sale, at fair value 256 258
Securities available-for-sale    
Amortized cost 256 256
Gross unrealized gains   2
Fair value 256 258
Total debt securities AFS
   
Investments summary    
Securities available-for-sale, at fair value 273,486 283,753
Securities available-for-sale    
Amortized cost 274,737 281,710
Gross unrealized gains 2,371 4,372
Gross unrealized losses 3,622 2,329
Fair value 273,486 283,753
Marketable equity securities AFS
   
Investments summary    
Securities available-for-sale, at fair value 3,892 4,942
Securities available-for-sale    
Amortized cost 3,816 4,643
Gross unrealized gains 224 444
Gross unrealized losses 148 145
Fair value 3,892 4,942
Total securities AFS
   
Investments summary    
Securities available-for-sale, at fair value 277,378 288,695
Securities available-for-sale    
Amortized cost 278,553 286,353
Gross unrealized gains 2,595 4,816
Gross unrealized losses 3,770 2,474
Fair value $ 277,378 $ 288,695