FAIR VALUE MEASUREMENTS (Details 9) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
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	$ 6,041	$ 6,873
Unfunded Commitments	875	1,193
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	41.00%
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	56.00%
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	3.00%
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	3,233	4,100
Unfunded Commitments	873	1,181
Average original expected lives	P10Y
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	2,549	3,185
Unfunded Commitments	659	945
Non-U.S.
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	179	165
Unfunded Commitments	25	57
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	163	316
Unfunded Commitments	16	39
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	87	182
Unfunded Commitments	21	42
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	255	252
Unfunded Commitments	152	98
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	2,808	2,773
Unfunded Commitments	2	12
Hedge fund investments redeemable monthly (as a percent)	15.00%
Hedge fund investments redeemable quarterly (as a percent)	34.00%
Hedge fund investments redeemable semi-annually (as a percent)	28.00%
Hedge fund investments redeemable annually (as a percent)	23.00%
Hedge fund investments redemption notices of less than 90 days (as a percent)	69.00%
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	74.00%
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	747	774
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	1,091	927
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	238	173
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	316	272
Unfunded Commitments		10
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	$ 416	$ 627