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INVESTMENTS (Details 8) (Purchased Credit Impaired (PCI) Securities, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Purchased Credit Impaired (PCI) Securities
         
Purchased Credit Impaired (PCI) Securities          
Contractually required payments (principal and interest) $ 18,315   $ 18,315    
Cash flows expected to be collected 14,286   14,286    
Recorded investment in acquired securities 9,128   9,128    
Outstanding principal balance 11,957   11,957   10,119
Amortized cost 7,743   7,743   7,006
Fair value 8,734   8,734   6,535
Changes in activity for the accretable yield on PCI securities:          
Balance, beginning of period 4,950 2,276 4,135    
Newly purchased PCI securities 114 306 1,532 2,688  
Disposals (130)   (298)    
Accretion (165) (119) (510) (194)  
Effect of changes in interest rate indices (39) (46) (200) (54)  
Net reclassification (to) from non-accretable difference, including effects of prepayments 53 (93) 124 (116)  
Balance, end of period $ 4,783 $ 2,324 $ 4,783 $ 2,324