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FAIR VALUE MEASUREMENTS (Details - Investments in certain other invested assets, including private equity funds, hedge funds and other alternative investments) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent $ 5,143 $ 5,997
Unfunded Commitments 1,318 1,239
Direct private equity    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 2,137 2,128
Unfunded Commitments $ 1,309 1,227
Average original expected lives 10 years  
Direct private equity | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Average original expected lives, Increments 2 years  
Direct private equity | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Average original expected lives, Increments 1 year  
Direct private equity | Expected remaining lives of less than 3 years    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 17.00%  
Direct private equity | Expected remaining lives of less than 3 years | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
First threshold level of remaining lives 3 years  
Direct private equity | Expected remaining lives of 4 to 6 years    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 40.00%  
Direct private equity | Expected remaining lives of 4 to 6 years | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Second threshold level of remaining lives 6 years  
Direct private equity | Expected remaining lives of 4 to 6 years | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Second threshold level of remaining lives 4 years  
Direct private equity | Expected remaining lives of 7 to 10 years    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 43.00%  
Direct private equity | Expected remaining lives of 7 to 10 years | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Third threshold level of remaining lives 10 years  
Direct private equity | Expected remaining lives of 7 to 10 years | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Third threshold level of remaining lives 7 years  
Leveraged buyout    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent $ 700 1,243
Unfunded Commitments 646 706
Real Estate / Infrastructure    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 185 210
Unfunded Commitments 84 187
Venture capital    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 102 134
Unfunded Commitments 113 73
Other..    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 624 155
Unfunded Commitments 324 53
Growth Equity    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 306 215
Unfunded Commitments 35 73
Mezzanine    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 220 171
Unfunded Commitments 107 135
Hedge funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 3,006 3,869
Unfunded Commitments $ 9 12
Hedge fund investments redeemable monthly (as a percent) 34.00%  
Hedge fund investments redeemable quarterly (as a percent) 34.00%  
Hedge fund investments redeemable semi-annually (as a percent) 9.00%  
Hedge fund investments redeemable annually (as a percent) 23.00%  
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 52.00%  
Hedge funds | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investment redemption notice period (in days/years) 180 days  
Hedge funds | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investment redemption notice period (in days/years) 1 day  
Event-driven    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent $ 888 1,128
Unfunded Commitments 0 0
Long-short    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 993 1,233
Unfunded Commitments 0 0
Macro    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 871 1,011
Unfunded Commitments 0 0
Distressed    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 44 266
Unfunded Commitments 8 8
Emerging markets    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments 0 0
Other hedge funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 210 231
Unfunded Commitments $ 1 $ 4