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INVESTMENTS (Details - Amortized cost or cost and fair value of available for sale securities) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance $ 244,337 $ 233,230
Available for sale securities, Allowance for Credit Losses (186) 0
Available for sale securities, Fair Value [1] 271,496 251,086
Bonds available for sale    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 244,337 233,230
Available for sale securities, Allowance for Credit Losses (186)  
Available for sale securities, Gross Unrealized Gains 28,253 18,671
Available for sale securities, Gross Unrealized Losses (908) (815)
Available for sale securities, Fair Value 271,496 251,086
Other details of available for sale securities    
Available for sale securities not rated or rated below investment grade 28,200 27,800
Bonds available for sale | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   1,186
Bonds available for sale | U.S. government and government sponsored entities    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 3,640 5,108
Available for sale securities, Allowance for Credit Losses 0  
Available for sale securities, Gross Unrealized Gains 503 316
Available for sale securities, Gross Unrealized Losses (17) (44)
Available for sale securities, Fair Value 4,126 5,380
Bonds available for sale | U.S. government and government sponsored entities | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   0
Bonds available for sale | Obligations of states, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 13,915 13,960
Available for sale securities, Allowance for Credit Losses 0  
Available for sale securities, Gross Unrealized Gains 2,216 1,390
Available for sale securities, Gross Unrealized Losses (7) (32)
Available for sale securities, Fair Value 16,124 15,318
Bonds available for sale | Obligations of states, municipalities and political subdivisions | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   0
Bonds available for sale | Non-U.S. governments    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 14,231 14,042
Available for sale securities, Allowance for Credit Losses (4)  
Available for sale securities, Gross Unrealized Gains 1,181 884
Available for sale securities, Gross Unrealized Losses (63) (57)
Available for sale securities, Fair Value 15,345 14,869
Bonds available for sale | Non-U.S. governments | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   (18)
Bonds available for sale | Corporate debt    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 150,111 138,046
Available for sale securities, Allowance for Credit Losses (164)  
Available for sale securities, Gross Unrealized Gains 19,905 12,090
Available for sale securities, Gross Unrealized Losses (554) (500)
Available for sale securities, Fair Value 169,298 149,636
Bonds available for sale | Corporate debt | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   7
Bonds available for sale | Mortgage-backed, asset-backed and collateralized    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 62,440 62,074
Available for sale securities, Allowance for Credit Losses (18)  
Available for sale securities, Gross Unrealized Gains 4,448 3,991
Available for sale securities, Gross Unrealized Losses (267) (182)
Available for sale securities, Fair Value 66,603 65,883
Bonds available for sale | Mortgage-backed, asset-backed and collateralized | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   1,197
Bonds available for sale | Residential mortgage-backed securities (RMBS)    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 28,551 29,802
Available for sale securities, Allowance for Credit Losses (16)  
Available for sale securities, Gross Unrealized Gains 3,000 3,067
Available for sale securities, Gross Unrealized Losses (70) (64)
Available for sale securities, Fair Value 31,465 32,805
Bonds available for sale | Residential mortgage-backed securities (RMBS) | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   1,149
Bonds available for sale | Commercial mortgage-backed securities (CMBS)    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 15,182 13,879
Available for sale securities, Allowance for Credit Losses (1)  
Available for sale securities, Gross Unrealized Gains 1,023 576
Available for sale securities, Gross Unrealized Losses (71) (25)
Available for sale securities, Fair Value 16,133 14,430
Bonds available for sale | Commercial mortgage-backed securities (CMBS) | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   34
Bonds available for sale | Collateralized Debt Obligations/Asset-Backed Securities (CDO/ABS)    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost or Cost, Net of Allowance 18,707 18,393
Available for sale securities, Allowance for Credit Losses (1)  
Available for sale securities, Gross Unrealized Gains 425 348
Available for sale securities, Gross Unrealized Losses (126) (93)
Available for sale securities, Fair Value $ 19,005 18,648
Bonds available for sale | Collateralized Debt Obligations/Asset-Backed Securities (CDO/ABS) | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Other-Than-Temporary Impairments in AOCI   $ 14
[1] See Note 10 for details of balances associated with variable interest entities.