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INVESTMENTS (Details 15) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Purchased Credit Impaired (PCI) Securities    
Amortized cost $ 248,531 $ 246,149
Fair value 261,930 273,171
Purchased Credit Impaired (PCI) Securities
   
Purchased Credit Impaired (PCI) Securities    
Contractually required payments (principal and interest) 25,374  
Cash flows expected to be collected 20,037  
Recorded investment in acquired securities 13,077  
Outstanding principal balance 14,741 11,791
Amortized cost 10,110 7,718
Fair value 11,338 8,823
Changes in activity for the accretable yield on PCI securities:    
Balance, beginning of year 4,766 4,135
Newly purchased PCI securities 1,773 1,620
Disposals (60) (298)
Accretion (719) (672)
Effect of changes in interest rate indices 302 (213)
Net reclassification from non-accretable difference, including effects of prepayments 878 194
Balance, end of year $ 6,940 $ 4,766