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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost $ 225,352   $ 225,461
Fair value 233,914   240,700
Purchased Credit Impaired (PCI) Securities      
Schedule of Available-for-sale Securities [Line Items]      
Contractually required payments (principal and interest) 36,711    
Cash flows expected to be collected 30,121    
Recorded investment in acquired securities 20,334    
Outstanding principal balance 14,253   14,718
Amortized cost 10,141   10,492
Fair value 11,977   $ 12,293
Changes in activity for the accretable yield on PCI securities:      
Balance, beginning of period 7,501 $ 7,498  
Newly purchased PCI securities 23 88  
Disposals 0 (18)  
Accretion (187) (210)  
Effect of changes in interest rate indices 206 21  
Net reclassification from non-accretable difference, including effects of prepayments 58 214  
Balance, end of period $ 7,601 $ 7,593