INVESTMENTS (Details 4) (USD $)			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Held-to-maturity	Mar. 31, 2013 Mortgage-backed securities	Dec. 31, 2012 Mortgage-backed securities	Mar. 31, 2013 Prime	Dec. 31, 2012 Prime	Mar. 31, 2013 Alt-A	Dec. 31, 2012 Alt-A	Mar. 31, 2013 Subprime	Dec. 31, 2012 Subprime	Mar. 31, 2013 Non-U.S. residential	Dec. 31, 2012 Non-U.S. residential	Mar. 31, 2013 Commercial	Dec. 31, 2012 Commercial	Mar. 31, 2013 State and municipal securities	Dec. 31, 2012 State and municipal securities	Mar. 31, 2013 Foreign government	Dec. 31, 2012 Foreign government	Mar. 31, 2013 Corporate	Dec. 31, 2012 Corporate	Mar. 31, 2013 Asset-backed securities	Dec. 31, 2012 Asset-backed securities
Debt Securities Held-to-maturity
Amortized cost	$ 11,276,000,000	$ 11,662,000,000		$ 4,777,000,000	$ 6,039,000,000	$ 135,000,000	$ 258,000,000	$ 2,135,000,000	$ 2,969,000,000	$ 83,000,000	$ 201,000,000	$ 2,334,000,000	$ 2,488,000,000	$ 90,000,000	$ 123,000,000	$ 1,343,000,000	$ 1,278,000,000	$ 3,816,000,000	$ 2,987,000,000	$ 821,000,000	$ 829,000,000	$ 519,000,000	$ 529,000,000
Net unrealized loss recognized in AOCI	1,220,000,000	1,532,000,000		1,026,000,000	1,330,000,000	26,000,000	49,000,000	617,000,000	837,000,000	9,000,000	43,000,000	374,000,000	401,000,000			72,000,000	73,000,000			97,000,000	103,000,000	25,000,000	26,000,000
Carrying value	10,056,000,000	10,130,000,000		3,751,000,000	4,709,000,000	109,000,000	209,000,000	1,518,000,000	2,132,000,000	74,000,000	158,000,000	1,960,000,000	2,087,000,000	90,000,000	123,000,000	1,271,000,000	1,205,000,000	3,816,000,000	2,987,000,000	724,000,000	726,000,000	494,000,000	503,000,000
Gross unrecognized gains	892,000,000	917,000,000		643,000,000	747,000,000	19,000,000	30,000,000	570,000,000	653,000,000	5,000,000	13,000,000	48,000,000	50,000,000	1,000,000	1,000,000	80,000,000	89,000,000	50,000,000		104,000,000	73,000,000	15,000,000	8,000,000
Gross unrecognized losses	331,000,000	403,000,000		290,000,000	358,000,000	2,000,000	4,000,000	224,000,000	250,000,000	8,000,000	21,000,000	55,000,000	81,000,000	1,000,000	2,000,000	38,000,000	37,000,000					3,000,000	8,000,000
Fair value	10,617,000,000	10,644,000,000		4,104,000,000	5,098,000,000	126,000,000	235,000,000	1,864,000,000	2,535,000,000	71,000,000	150,000,000	1,953,000,000	2,056,000,000	90,000,000	122,000,000	1,313,000,000	1,257,000,000	3,866,000,000	2,987,000,000	828,000,000	799,000,000	506,000,000	503,000,000
Unrealized loss, other than temporary impairment, not credit loss, recorded in AOCI	1,200,000,000	1,500,000,000
Gross unrealized losses included in other-than-temporary-impairment losses on investments			$ 0