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FAIR VALUE MEASUREMENT (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Morgan Stanley Smith Barney joint venture
Sep. 30, 2012
Morgan Stanley Smith Barney joint venture
Sep. 16, 2012
Morgan Stanley Smith Barney joint venture
Mar. 31, 2013
Nonrecurring
Nonrecurring fair value changes included in earnings
Mar. 31, 2012
Nonrecurring
Nonrecurring fair value changes included in earnings
Mar. 31, 2013
Nonrecurring
Fair value
Dec. 31, 2012
Nonrecurring
Fair value
Mar. 31, 2013
Nonrecurring
Fair value
Morgan Stanley Smith Barney joint venture
Mar. 31, 2012
Nonrecurring
Fair value
Morgan Stanley Smith Barney joint venture
Mar. 31, 2013
Nonrecurring
Level 2
Dec. 31, 2012
Nonrecurring
Level 2
Mar. 31, 2013
Nonrecurring
Level 3
Dec. 31, 2012
Nonrecurring
Level 3
Items Measured at Fair Value on a Nonrecurring Basis                          
Loans held-for-sale           $ 4,954 $ 2,647     $ 3,716 $ 1,159 $ 1,238 $ 1,488
Other real estate owned           169 201     28 22 141 179
Loans           4,330 5,732     3,773 5,160 557 572
Other assets           4,725 4,725     4,725 4,725    
Total assets           14,178 13,305     12,242 11,066 1,936 2,239
Nonrecurring fair value changes included in earnings                          
Loans held-for-sale       (81) (50)                
Other real estate owned       (6) (14)                
Loans       (249) (769)                
Total nonrecurring fair value gains (losses)       $ (336) $ (833)                
Percentage of ownership interest held 35.00% 35.00% 49.00%         35.00% 35.00%