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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 225,461 $ 232,241
Fair value 240,700 243,615
Purchased Credit Impaired (PCI) Securities    
Schedule of Available-for-sale Securities [Line Items]    
Contractually required payments (principal and interest) 36,642  
Cash flows expected to be collected 30,040  
Recorded investment in acquired securities 20,267  
Outstanding principal balance 14,718 16,728
Amortized cost 10,492 11,987
Fair value 12,293 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 7,498 6,846
Newly purchased PCI securities 190 707
Disposals (18) 0
Accretion (797) (842)
Effect of changes in interest rate indices (34) 39
Net reclassification from non-accretable difference, including effects of prepayments 662 748
Balance, end of period $ 7,501 $ 7,498