FAIR VALUE MEASUREMENTS (Details 7) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	$ 6,379	$ 6,041
Unfunded Commitments	938	875
Expected remaining lives of less than 3 years
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
First threshold level of remaining lives	3 years
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	63.00%
Expected remaining lives of less than 3 to 7 years
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Second threshold level of remaining lives	7 years
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	35.00%
Expected remaining lives of less than 7 to 10 years
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Third threshold level of remaining lives	10 years
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	2.00%
Private equity funds:
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	3,208	3,233
Unfunded Commitments	936	873
Average original expected lives	10 years
Investment redemption notice period (in days/years)	1 year
Second investment redemption notice period	2 years
Leveraged buyout
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	2,487	2,529
Unfunded Commitments	646	669
Real Estate / Infrastructure
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	263	251
Unfunded Commitments	51	52
Venture capital
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	150	157
Unfunded Commitments	16	16
Distressed
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	185	184
Unfunded Commitments	39	36
Other..
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	123	112
Unfunded Commitments	184	100
Hedge funds:
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	3,171	2,808
Unfunded Commitments	2	2
Hedge fund investments redeemable monthly (as a percent)	15.00%
Hedge fund investments redeemable quarterly (as a percent)	37.00%
Hedge fund investments redeemable semi-annually (as a percent)	26.00%
Hedge fund investments redeemable annually (as a percent)	22.00%
Hedge fund investments redemption notices of less than 90 days (as a percent)	65.00%
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	77.00%
Investment redemption notice period (in days/years)	1 day to 180 days
Event-driven
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	899	788
Unfunded Commitments	2	2
Long-short
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	1,405	1,318
Macro
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	470	320
Distressed.
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	342	316
Other hedge funds
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value Per Share or its equivalent	$ 55	$ 66