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INVESTMENTS (Details - Amortized cost or cost and fair value of Available for sale securities) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total $ 226,766 $ 233,938
Available for sale securities, Gross Unrealized Gains 15,315 12,817
Available for sale securities, Gross Unrealized Losses (1,381) (3,140)
Available-for-sale Securities 240,700 243,615
AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 1,656 1,265
Bonds available for sale    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 225,461 232,241
Available for sale securities, Gross Unrealized Gains 14,891 12,421
Available for sale securities, Gross Unrealized Losses (1,360) (3,125)
Available-for-sale Securities 238,992 241,537
Other details of available for sale securities    
Available for sale securities not rated or rated below investment grade 31,500 33,600
Bonds available for sale | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 1,656 1,265
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, Total 2,532 1,870
Available for sale securities, Gross Unrealized Gains 160 148
Available for sale securities, Gross Unrealized Losses (36) (26)
Available-for-sale Securities 2,656 1,992
Bonds available for sale | U.S. government and government sponsored entities | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 0 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, Total 17,377 24,025
Available for sale securities, Gross Unrealized Gains 1,297 1,001
Available for sale securities, Gross Unrealized Losses (30) (254)
Available-for-sale Securities 18,644 24,772
Bonds available for sale | Obligations of states, municipalities and political subdivisions | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 0 0
Bonds available for sale | Non-U.S. governments    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 15,059 14,018
Available for sale securities, Gross Unrealized Gains 717 773
Available for sale securities, Gross Unrealized Losses (117) (256)
Available-for-sale Securities 15,659 14,535
Bonds available for sale | Non-U.S. governments | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 0 0
Bonds available for sale | Corporate debt    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 126,310 126,648
Available for sale securities, Gross Unrealized Gains 8,666 7,271
Available for sale securities, Gross Unrealized Losses (800) (1,739)
Available-for-sale Securities 134,176 132,180
Bonds available for sale | Corporate debt | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 17 (31)
Bonds available for sale | Mortgage-backed, asset-backed and collateralized    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 64,183 65,680
Available for sale securities, Gross Unrealized Gains 4,051 3,228
Available for sale securities, Gross Unrealized Losses (377) (850)
Available-for-sale Securities 67,857 68,058
Bonds available for sale | Mortgage-backed, asset-backed and collateralized | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 1,639 1,296
Bonds available for sale | Residential mortgage-backed securities (RMBS)    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 34,181 35,311
Available for sale securities, Gross Unrealized Gains 3,273 2,541
Available for sale securities, Gross Unrealized Losses (220) (478)
Available-for-sale Securities 37,234 37,374
Bonds available for sale | Residential mortgage-backed securities (RMBS) | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 1,568 1,212
Bonds available for sale | Commercial mortgage-backed securities (CMBS)    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 13,538 14,054
Available for sale securities, Gross Unrealized Gains 408 409
Available for sale securities, Gross Unrealized Losses (105) (192)
Available-for-sale Securities 13,841 14,271
Bonds available for sale | Commercial mortgage-backed securities (CMBS) | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 42 45
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, Total 16,464 16,315
Available for sale securities, Gross Unrealized Gains 370 278
Available for sale securities, Gross Unrealized Losses (52) (180)
Available-for-sale Securities 16,782 16,413
Bonds available for sale | Collateralized Debt Obligations/Asset-Backed Securities (CDO/ABS) | AOCI- OTTI    
Schedule of Available-for-sale Securities [Line Items]    
Total, Other-Than-Temporary Impairments in AOCI 29 39
Equity securities available for sale    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 1,305 1,697
Available for sale securities, Gross Unrealized Gains 424 396
Available for sale securities, Gross Unrealized Losses (21) (15)
Available-for-sale Securities 1,708 2,078
Equity securities available for sale | Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 703 708
Available for sale securities, Gross Unrealized Gains 379 369
Available for sale securities, Gross Unrealized Losses (21) (12)
Available-for-sale Securities 1,061 1,065
Equity securities available for sale | Preferred Stock    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 504 748
Available for sale securities, Gross Unrealized Gains 29 4
Available for sale securities, Gross Unrealized Losses 0 0
Available-for-sale Securities 533 752
Equity securities available for sale | Mutual Funds    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost, Total 98 241
Available for sale securities, Gross Unrealized Gains 16 23
Available for sale securities, Gross Unrealized Losses 0 (3)
Available-for-sale Securities $ 114 $ 261