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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 225,780 $ 225,461
Fair value 229,391 240,700
Purchased Credit Impaired (PCI) Securities    
Schedule of Available-for-sale Securities [Line Items]    
Contractually required payments (principal and interest) 36,519  
Cash flows expected to be collected 29,980  
Recorded investment in acquired securities 20,229  
Outstanding principal balance 12,495 14,718
Amortized cost 8,646 10,492
Fair value 10,280 12,293
Available for sale securities | Purchased Credit Impaired (PCI) Securities    
Changes in activity for the accretable yield on PCI securities:    
Balance, beginning of period 7,501 7,498
Newly purchased PCI securities 33 190
Disposals (21) (18)
Accretion (722) (797)
Effect of changes in interest rate indices 207 (34)
Net reclassification from (to) non-accretable difference, including effects of prepayments 212 662
Balance, end of period $ 7,210 $ 7,501