INVESTMENTS (Details 5) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value less than 12 months	$ 54,000,000	$ 382,000,000
Gross unrecognized losses less than 12 months	2,000,000	7,000,000
Fair value 12 months or longer	2,128,000,000	2,311,000,000
Gross unrecognized losses 12 months or longer	329,000,000	396,000,000
Fair value, total	2,182,000,000	2,693,000,000
Gross unrecognized losses, total	331,000,000	403,000,000
Unrealized loss, other than temporary impairment, not credit loss, recorded in AOCI	1,200,000,000	1,500,000,000
Mortgage-backed securities
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value less than 12 months	54,000,000	88,000,000
Gross unrecognized losses less than 12 months	2,000,000	7,000,000
Fair value 12 months or longer	1,160,000,000	1,522,000,000
Gross unrecognized losses 12 months or longer	288,000,000	351,000,000
Fair value, total	1,214,000,000	1,610,000,000
Gross unrecognized losses, total	290,000,000	358,000,000
State and municipal securities
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value 12 months or longer	418,000,000	383,000,000
Gross unrecognized losses 12 months or longer	38,000,000	37,000,000
Fair value, total	418,000,000	383,000,000
Gross unrecognized losses, total	38,000,000	37,000,000
Foreign Government
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value less than 12 months		294,000,000
Fair value 12 months or longer	294,000,000
Fair value, total	294,000,000	294,000,000
Asset-backed securities
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value 12 months or longer	256,000,000	406,000,000
Gross unrecognized losses 12 months or longer	3,000,000	8,000,000
Fair value, total	256,000,000	406,000,000
Gross unrecognized losses, total	$ 3,000,000	$ 8,000,000