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INVESTMENTS (Details - Schedule of purchased credit impaired (PCI) securities) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost     $ 237,345 $ 233,230
Bonds available for sale, at fair value, net of allowance for credit losses of $198 in 2020 (amortized cost: 2020 - $237,345; 2019 - $233,230)     $ 258,505 251,086
Purchased Credit Impaired (PCI) Securities        
Schedule of Available-for-sale Securities [Line Items]        
Contractually required payments (principal and interest)       35,139
Cash flows expected to be collected       28,720
Recorded investment in acquired securities       19,382
Outstanding principal balance       10,476
Amortized cost       6,970
Bonds available for sale, at fair value, net of allowance for credit losses of $198 in 2020 (amortized cost: 2020 - $237,345; 2019 - $233,230)       $ 8,664
Available for sale securities | Purchased Credit Impaired (PCI) Securities        
Changes in activity for the accretable yield on PCI securities:        
Balance, beginning of year $ 6,801 $ 7,210    
Newly purchased PCI securities 1 13    
Accretion (151) (323)    
Effect of changes in interest rate indices (266) (400)    
Net reclassification from (to) non-accretable difference, including effects of prepayments 17 (98)    
Balance, end of year $ 6,402 $ 6,402