FAIR VALUE MEASUREMENTS (Details - Investments in certain other invested assets, including private equity funds, hedge funds and other alternative investments) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 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	$ 5,934	$ 5,997
Unfunded Commitments	1,270	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	2,245	2,128
Unfunded Commitments	$ 1,259	1,227
Average original expected lives	10 years
Second investment redemption notice period	2 years
Direct private equity | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Average original expected lives	2 years
Direct private equity | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Average original expected lives	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	55.00%
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	23.00%
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	22.00%
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	$ 1,261	1,243
Unfunded Commitments	719	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	238	210
Unfunded Commitments	166	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	145	134
Unfunded Commitments	133	73
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	109	113
Unfunded Commitments	43	42
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	492	428
Unfunded Commitments	198	219
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	3,689	3,869
Unfunded Commitments	$ 11	12
Hedge fund investments redeemable monthly (as a percent)	26.00%
Hedge fund investments redeemable quarterly (as a percent)	40.00%
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	55.00%
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	$ 1,074	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	1,196	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	1,045	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	170	266
Unfunded Commitments	8	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	204	231
Unfunded Commitments	$ 3	$ 4