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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]          
Amortized cost $ 223,080   $ 223,080   $ 225,461
Fair value 228,673   228,673   240,700
Purchased Credit Impaired (PCI) Securities          
Schedule of Available-for-sale Securities [Line Items]          
Contractually required payments (principal and interest) 36,659   36,659    
Cash flows expected to be collected 30,085   30,085    
Recorded investment in acquired securities 20,304   20,304    
Outstanding principal balance 13,653   13,653   14,718
Amortized cost 9,628   9,628   10,492
Fair value 11,446   11,446   $ 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 7,601 $ 7,593 7,501 $ 7,498  
Newly purchased PCI securities 4 13 27 101  
Disposals 0 0 0 (18)  
Accretion (190) (206) (377) (416)  
Effect of changes in interest rate indices (32) (135) 174 (114)  
Net reclassification from (to) non-accretable difference, including effects of prepayments 78 200 136 414  
Balance, end of period $ 7,461 $ 7,465 $ 7,461 $ 7,465