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INVESTMENTS (Details 10) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Purchased Credit Impaired (PCI) Securities          
Amortized cost $ 249,062   $ 249,062   $ 246,149
Fair value 263,279   263,279   273,171
Purchased Credit Impaired (PCI) Securities
         
Purchased Credit Impaired (PCI) Securities          
Contractually required payments (principal and interest) 23,784   23,784    
Cash flows expected to be collected 18,763   18,763    
Recorded investment in acquired securities 12,268   12,268    
Outstanding principal balance 14,104   14,104   11,791
Amortized cost 9,609   9,609   7,718
Fair value 10,685   10,685   8,823
Changes in activity for the accretable yield on PCI securities:          
Balance, beginning of period 5,901 4,950 4,766 4,135  
Newly purchased PCI securities 202 114 1,308 1,532  
Disposals   (130) (60) (298)  
Accretion (187) (165) (517) (510)  
Effect of changes in interest rate indices 282 (39) 388 (200)  
Net reclassification from non-accretable difference, including effects of prepayments 405 53 718 124  
Balance, end of period $ 6,603 $ 4,783 $ 6,603 $ 4,783