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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 233,230 $ 225,780
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 12,495
Amortized cost 6,970 8,646
Fair value 8,664 10,280
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 7,501
Newly purchased PCI securities 17 33
Disposals 0 (21)
Accretion (624) (722)
Effect of changes in interest rate indices (541) 207
Net reclassification from (to) non-accretable difference, including effects of prepayments (350) 212
Balance, end of year 5,705 7,210
Available for sale securities | Purchased Credit Impaired (PCI) Securities | Held for sale [Member]    
Changes in activity for the accretable yield on PCI securities:    
Activities related to businesses reclassified to held for sale $ (7) $ 0