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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost $ 241,730   $ 240,968
Fair value 256,555   251,160
Purchased Credit Impaired (PCI) Securities      
Schedule of Available-for-sale Securities [Line Items]      
Contractually required payments (principal and interest) 33,999    
Cash flows expected to be collected 27,609    
Recorded investment in acquired securities 18,476    
Outstanding principal balance 17,011   16,871
Amortized cost 12,442   12,303
Fair value 12,979   $ 13,164
Changes in activity for the accretable yield on PCI securities:      
Balance, beginning of year 6,846 $ 6,865  
Newly purchased PCI securities 206 245  
Disposals 0 0  
Accretion (214) (220)  
Effect of changes in interest rate indices (299) (138)  
Net reclassification from non-accretable difference, including effects of prepayments 83 13  
Balance, end of year $ 6,622 $ 6,765