INVESTMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Mortgage-backed securities
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	$ 14,255	$ 8,808
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	175	138
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	448	500
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	29	28
Total fair value of available for sale securities that have been in an unrealized loss position	14,703	9,308
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	204	166
U.S. government-sponsored agency guaranteed
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	13,862	8,759
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	171	138
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	424	464
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	28	25
Total fair value of available for sale securities that have been in an unrealized loss position	14,286	9,223
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	199	163
Prime
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	17	15
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	4	5
Total fair value of available for sale securities that have been in an unrealized loss position	21	20
Alt-A
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	64
Total fair value of available for sale securities that have been in an unrealized loss position	64
Non-U.S. residential
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	239	5
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	3
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	11	7
Total fair value of available for sale securities that have been in an unrealized loss position	250	12
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	3
Commercial
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	73	29
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	1
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	9	24
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	1	3
Total fair value of available for sale securities that have been in an unrealized loss position	82	53
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	2	3
U.S. Treasury and federal agency securities
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	8,512	11,054
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	113	35
Total fair value of available for sale securities that have been in an unrealized loss position	8,512	11,054
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	113	35
U.S. Treasury
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	6,785	10,558
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	112	34
Total fair value of available for sale securities that have been in an unrealized loss position	6,785	10,558
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	112	34
Agency obligations
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	1,727	496
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	1	1
Total fair value of available for sale securities that have been in an unrealized loss position	1,727	496
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	1	1
State and municipal securities
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	20	10
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	11,334	11,095
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	1,940	1,820
Total fair value of available for sale securities that have been in an unrealized loss position	11,354	11,105
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	1,940	1,820
Foreign government
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	19,390	22,806
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	100	54
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	3,511	3,910
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	49	76
Total fair value of available for sale securities that have been in an unrealized loss position	22,901	26,716
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	149	130
Corporate
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	1,888	1,420
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	12	8
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	60	225
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	2	18
Total fair value of available for sale securities that have been in an unrealized loss position	1,948	1,645
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	14	26
Asset-backed securities
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	2,527	1,942
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	78	4
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	843	2,888
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	32	139
Total fair value of available for sale securities that have been in an unrealized loss position	3,370	4,830
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	110	143
Marketable equity securities AFS
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	21	15
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	2	1
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	758	764
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	141	144
Total fair value of available for sale securities that have been in an unrealized loss position	779	779
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	143	145
Total securities AFS
Available for Sale Securities Continuous Unrealized Loss Position
Fair value of available for sale securities that have been in an unrealized loss position for less than twelve months	46,613	46,055
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	480	240
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	16,954	19,382
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	2,193	2,225
Total fair value of available for sale securities that have been in an unrealized loss position	63,567	65,437
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	$ 2,673	$ 2,465