INVESTMENTS (Details 5) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value less than 12 months	$ 1,094,000,000	$ 1,215,000,000
Gross unrecognized losses less than 12 months	71,000,000	134,000,000
Fair value 12 months or longer	3,379,000,000	7,242,000,000
Gross unrecognized losses 12 months or longer	543,000,000	1,031,000,000
Fair value, total	4,473,000,000	8,457,000,000
Gross unrecognized losses, total	614,000,000	1,165,000,000
Gross unrecognized losses 12 months or longer for securities reclassified from AFS investments	1,900,000,000	2,300,000,000
Mortgage-backed securities
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value less than 12 months	753,000,000	735,000,000
Gross unrecognized losses less than 12 months	55,000,000	63,000,000
Fair value 12 months or longer	1,895,000,000	4,827,000,000
Gross unrecognized losses 12 months or longer	458,000,000	689,000,000
Fair value, total	2,648,000,000	5,562,000,000
Gross unrecognized losses, total	513,000,000	752,000,000
State and municipal securities
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value 12 months or longer	522,000,000	682,000,000
Gross unrecognized losses 12 months or longer	49,000,000	72,000,000
Fair value, total	522,000,000	682,000,000
Gross unrecognized losses, total	49,000,000	72,000,000
Corporate
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value 12 months or longer	613,000,000	1,427,000,000
Gross unrecognized losses 12 months or longer	4,000,000	254,000,000
Fair value, total	613,000,000	1,427,000,000
Gross unrecognized losses, total	4,000,000	254,000,000
Asset-backed securities
Held-to-maturity Securities, Continuous Unrealized Loss Position
Fair value less than 12 months	341,000,000	480,000,000
Gross unrecognized losses less than 12 months	16,000,000	71,000,000
Fair value 12 months or longer	349,000,000	306,000,000
Gross unrecognized losses 12 months or longer	32,000,000	16,000,000
Fair value, total	690,000,000	786,000,000
Gross unrecognized losses, total	$ 48,000,000	$ 87,000,000