INVESTMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 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	$ 9,492	$ 8,878
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	65	56
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	413	179
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	28	32
Total fair value of available for sale securities that have been in an unrealized loss position	9,905	9,057
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	93	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	7,701	5,398
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	60	32
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	301	51
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	18	19
Total fair value of available for sale securities that have been in an unrealized loss position	8,002	5,449
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	78	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	23	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	34	40
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	3	5
Total fair value of available for sale securities that have been in an unrealized loss position	57	67
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	3	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	1,737	3,418
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	5	22
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	49	57
Total fair value of available for sale securities that have been in an unrealized loss position	1,786	3,475
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	5	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	31	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	29	31
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	7	8
Total fair value of available for sale securities that have been in an unrealized loss position	60	66
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	7	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	18,548	3,523
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	51	2
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	49
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	1
Total fair value of available for sale securities that have been in an unrealized loss position	18,597	3,523
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	52	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	14,795	553
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	46
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	49
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	1
Total fair value of available for sale securities that have been in an unrealized loss position	14,844	553
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	47
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	3,753	2,970
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	5	2
Total fair value of available for sale securities that have been in an unrealized loss position	3,753	2,970
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	5	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	3	59
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	29	2
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	11,110	11,591
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	1,968	2,552
Total fair value of available for sale securities that have been in an unrealized loss position	11,113	11,650
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	1,997	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	32,177	33,109
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	132	211
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	8,783	11,205
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	167	193
Total fair value of available for sale securities that have been in an unrealized loss position	40,960	44,314
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	299	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	1,893	2,104
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	11	24
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	203	203
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	21	29
Total fair value of available for sale securities that have been in an unrealized loss position	2,096	2,307
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	32	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	3,261	4,625
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	51	68
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	504	466
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	13	13
Total fair value of available for sale securities that have been in an unrealized loss position	3,765	5,091
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	64	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	17	47
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	2	5
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	1,331	1,457
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	165	190
Total fair value of available for sale securities that have been in an unrealized loss position	1,348	1,504
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	167	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	65,391	52,509
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months	341	368
Fair value of available for sale securities that have been in an unrealized loss position for twelve months or longer	22,393	25,101
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer	2,363	3,009
Total fair value of available for sale securities that have been in an unrealized loss position	87,784	77,610
Total gross unrealized losses of available for sale securities that have been in an unrealized loss position	$ 2,704	$ 3,377