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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]          
Amortized cost $ 228,047   $ 228,047   $ 225,461
Fair value 232,720   232,720   240,700
Purchased Credit Impaired (PCI) Securities          
Schedule of Available-for-sale Securities [Line Items]          
Contractually required payments (principal and interest) 36,640   36,640    
Cash flows expected to be collected 30,077   30,077    
Recorded investment in acquired securities 20,294   20,294    
Outstanding principal balance 13,060   13,060   14,718
Amortized cost 9,087   9,087   10,492
Fair value 10,941   10,941   $ 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 7,461 $ 7,465 7,501 $ 7,498  
Newly purchased PCI securities 5 16 32 117  
Disposals 0 0 0 (18)  
Accretion (176) (193) (553) (609)  
Effect of changes in interest rate indices 15 (74) 189 (188)  
Net reclassification from (to) non-accretable difference, including effects of prepayments 93 172 229 586  
Balance, end of period $ 7,398 $ 7,386 $ 7,398 $ 7,386