FAIR VALUE MEASUREMENTS (Details 9) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Dec. 31, 2011
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	$ 7,319	$ 6,873
Unfunded Commitments	1,181	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 (in years)	3
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	44.00%
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 (in years)	7
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	54.00%
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 (in years)	10
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	4,277	4,100
Unfunded Commitments	1,179	1,181
Expected remaining lives that funds in some cases extend beyond (in years)	10
Investment redemption notice period (in days/years)	1 year
Leveraged buyout
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	3,244	3,185
Unfunded Commitments	900	945
Non-U.S.
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	171	165
Unfunded Commitments	54	57
Venture capital
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	301	316
Unfunded Commitments	37	39
Distressed
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	189	182
Unfunded Commitments	38	42
Other..
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	372	252
Unfunded Commitments	150	98
Hedge funds:
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	3,042	2,773
Unfunded Commitments	2	12
Hedge fund investments redeemable monthly (as a percent)	10.00%
Hedge fund investments redeemable quarterly (as a percent)	35.00%
Hedge fund investments redeemable semi-annually (as a percent)	25.00%
Hedge fund investments redeemable annually (as a percent)	30.00%
Hedge fund investments redemption notices of less than 90 days (as a percent)	62.00%
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part	55.00%
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	872	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	1,097	927
Relative value
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	48	52
Distressed.
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE
Fair Value Using Net Asset Value	289	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	$ 736	$ 748