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INVESTMENTS (Details - Schedule of purchased credit impaired (PCI) securities) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost   $ 234,586 $ 233,230
Bonds available for sale, at fair value, net of allowance for credit losses of $211 in 2020 (amortized cost: 2020 - $234,586; 2019 - $233,230)   $ 241,776 251,086
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 $211 in 2020 (amortized cost: 2020 - $234,586; 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 $ 7,210    
Newly purchased PCI securities 12    
Accretion (172)    
Effect of changes in interest rate indices (134)    
Net reclassification from (to) non-accretable difference, including effects of prepayments (115)    
Activities related to businesses reclassified to held for sale 0    
Balance, end of year $ 6,801