FAIR VALUE MEASUREMENTS (Details - Investments in certain other invested assets, including private equity funds, hedge funds and other alternative investments) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 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	$ 5,997	$ 6,741
Unfunded Commitments	1,239	1,279
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	2,128	2,254
Unfunded Commitments	$ 1,227	1,248
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	58.00%
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	0 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	17.00%
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	0 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	0 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	25.00%
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	0 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	0 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	$ 1,243	1,424
Unfunded Commitments	706	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	210	258
Unfunded Commitments	187	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	134	137
Unfunded Commitments	73	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	113	123
Unfunded Commitments	42	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	428	312
Unfunded Commitments	219	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	3,869	4,487
Unfunded Commitments	$ 12	31
Hedge fund investments redeemable monthly (as a percent)	22.00%
Hedge fund investments redeemable quarterly (as a percent)	43.00%
Hedge fund investments redeemable semi-annually (as a percent)	12.00%
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	$ 1,128	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	1,233	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	1,011	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	266	416
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	231	197
Unfunded Commitments	$ 4	$ 14