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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]          
Amortized cost $ 230,062   $ 230,062   $ 225,780
Purchased Credit Impaired (PCI) Securities          
Schedule of Available-for-sale Securities [Line Items]          
Contractually required payments (principal and interest) 36,306   36,306    
Cash flows expected to be collected 29,786   29,786    
Recorded investment in acquired securities 20,097   20,097    
Outstanding principal balance 11,576   11,576   12,495
Amortized cost 7,879   7,879   8,646
Fair value 9,639   9,639   $ 10,280
Available for sale securities | Purchased Credit Impaired (PCI) Securities          
Changes in activity for the accretable yield on PCI securities:          
Balance, beginning of period 6,801 $ 7,601 7,210 $ 7,501  
Newly purchased PCI securities 1 4 13 27  
Accretion (151) (190) (323) (377)  
Effect of changes in interest rate indices (266) (32) (400) 174  
Net reclassification from (to) non-accretable difference, including effects of prepayments 17 78 (98) 136  
Balance, end of period $ 6,402 $ 7,461 $ 6,402 $ 7,461