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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, 2017
Dec. 31, 2016
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent $ 6,243 $ 6,741
Unfunded Commitments 1,281 1,279
Private equity 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 2,182 2,254
Unfunded Commitments $ 1,270 1,248
Average original expected lives 10 years  
Second investment redemption notice period 2 years  
Private equity funds | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Average original expected lives 2 years  
Private equity funds | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Average original expected lives 1 year  
Private equity funds | 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 62.00%  
Private equity funds | 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  
Private equity funds | 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 17.00%  
Private equity funds | 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  
Private equity funds | 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  
Private equity funds | 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 21.00%  
Private equity funds | 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  
Private equity funds | 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 $ 1,310 1,424
Unfunded Commitments 761 750
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 226 258
Unfunded Commitments 185 208
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 127 137
Unfunded Commitments 44 31
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 119 123
Unfunded Commitments 43 44
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 400 312
Unfunded Commitments 237 215
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 4,061 4,487
Unfunded Commitments $ 11 31
Hedge fund investments redeemable monthly (as a percent) 21.00%  
Hedge fund investments redeemable quarterly (as a percent) 45.00%  
Hedge fund investments redeemable semi-annually (as a percent) 11.00%  
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 49.00%  
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 $ 1,228 1,453
Unfunded Commitments 0 9
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 1,317 1,429
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 1,016 992
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 278 416
Unfunded Commitments 7 8
Emerging markets    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value Using Net Asset Value Per Share or its equivalent 0 0
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 222 197
Unfunded Commitments $ 4 $ 14