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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]          
Amortized cost $ 224,143   $ 224,143   $ 232,241
Fair value 239,478   239,478   243,615
Purchased Credit Impaired (PCI) Securities          
Schedule of Available-for-sale Securities [Line Items]          
Contractually required payments (principal and interest) 36,228   36,228    
Cash flows expected to be collected 29,649   29,649    
Recorded investment in acquired securities 19,944   19,944    
Outstanding principal balance 14,977   14,977   16,728
Amortized cost 10,636   10,636   11,987
Fair value 12,470   12,470   $ 12,922
Available for sale securities | Purchased Credit Impaired (PCI) Securities          
Changes in activity for the accretable yield on PCI securities:          
Balance, beginning of period 7,465 $ 7,043 7,498 $ 6,846  
Newly purchased PCI securities 16 177 117 628  
Disposals 0 0 (18) 0  
Accretion (193) (214) (609) (637)  
Effect of changes in interest rate indices (74) (196) (188) (435)  
Net reclassification from non-accretable difference, including effects of prepayments 172 158 586 566  
Balance, end of period $ 7,386 $ 6,968 $ 7,386 $ 6,968