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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost $ 228,608   $ 225,780
Fair value 238,201   229,391
Purchased Credit Impaired (PCI) Securities      
Schedule of Available-for-sale Securities [Line Items]      
Contractually required payments (principal and interest) 36,385    
Cash flows expected to be collected 29,862    
Recorded investment in acquired securities 20,156    
Outstanding principal balance 12,063   12,495
Amortized cost 8,307   8,646
Fair value 9,973   $ 10,280
Available for sale securities | Purchased Credit Impaired (PCI) Securities      
Changes in activity for the accretable yield on PCI securities:      
Balance, beginning of period 7,210 $ 7,501  
Newly purchased PCI securities 12 23  
Disposals 0 0  
Accretion (172) (187)  
Effect of changes in interest rate indices (134) 206  
Net reclassification from (to) non-accretable difference, including effects of prepayments (115) 58  
Balance, end of period $ 6,801 $ 7,601