INVESTMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
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	$ 2,566	$ 8,878
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	35	56
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	528	179
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	31	32
Total fair value of available for sale securities that have been in an unrealized loss position	3,094	9,057
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	66	88
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	2,548	5,398
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	35	32
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	462	51
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	27	19
Total fair value of available for sale securities that have been in an unrealized loss position	3,010	5,449
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	62	51
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		27
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	16	40
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer		5
Total fair value of available for sale securities that have been in an unrealized loss position	16	67
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position		6
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	12	3,418
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months		22
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	18	57
Total fair value of available for sale securities that have been in an unrealized loss position	30	3,475
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position		22
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	6	35
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	32	31
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	4	8
Total fair value of available for sale securities that have been in an unrealized loss position	38	66
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	4	9
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	5,055	3,523
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	18	2
Total fair value of available for sale securities that have been in an unrealized loss position	5,055	3,523
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	18	2
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	4,831	553
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	18
Total fair value of available for sale securities that have been in an unrealized loss position	4,831	553
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	18
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	224	2,970
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months		2
Total fair value of available for sale securities that have been in an unrealized loss position	224	2,970
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position		2
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	345	59
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	26	2
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	11,097	11,591
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	1,780	2,552
Total fair value of available for sale securities that have been in an unrealized loss position	11,442	11,650
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	1,806	2,554
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	21,103	33,109
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	71	211
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	5,950	11,205
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	110	193
Total fair value of available for sale securities that have been in an unrealized loss position	27,053	44,314
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	181	404
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	1,385	2,104
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	8	24
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	254	203
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	23	29
Total fair value of available for sale securities that have been in an unrealized loss position	1,639	2,307
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	31	53
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	962	4,625
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	5	68
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	3,248	466
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	150	13
Total fair value of available for sale securities that have been in an unrealized loss position	4,210	5,091
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	155	81
Other debt 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		164
Total fair value of available for sale securities that have been in an unrealized loss position		164
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	1,619	47
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	27	5
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	1,070	1,457
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	136	190
Total fair value of available for sale securities that have been in an unrealized loss position	2,689	1,504
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	163	195
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	33,035	52,509
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	190	368
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	22,147	25,101
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	2,230	3,009
Total fair value of available for sale securities that have been in an unrealized loss position	55,182	77,610
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	$ 2,420	$ 3,377