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INVESTMENTS (Details - Schedule of purchased credit impaired (PCI) securities) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 233,230 $ 244,337
Bonds available for sale [1] 251,086 271,496
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 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 17  
Accretion (624)  
Effect of changes in interest rate indices (541)  
Net reclassification from (to) non-accretable difference, including effects of prepayments (350)  
Activities related to businesses reclassified to held for sale (7)  
Balance, end of year $ 5,705  
[1] See Note 10 for details of balances associated with variable interest entities.