Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Segment Information [Abstract]
Realized Investment Gains Losses After Tax	$ 11	$ 14	$ 28	$ 11
Segment Text Detail [Abstract]
Percent International Revenues South Korea	31.00%		31.00%
Precent International Earnings South Korea	55.00%		51.00%
Health Care Segment [Member]
Segment Reporting Information [Line Items]
Premiums and fees, Mail order pharmacy revenues and Other revenues	3,711	3,692	7,430	7,423
Segment income from continuing operations	280	247	527	414
Disability And Life Segment [Member]
Segment Reporting Information [Line Items]
Premiums and fees, Mail order pharmacy revenues and Other revenues	717	678	1,405	1,368
Segment income from continuing operations	88	89	170	159
International Segment [Member]
Segment Reporting Information [Line Items]
Premiums and fees, Mail order pharmacy revenues and Other revenues	742	550	1,448	1,084
Segment income from continuing operations	74	64	151	136
Run Off Reinsurance Segment [Member]
Segment Reporting Information [Line Items]
Premiums and fees, Mail order pharmacy revenues and Other revenues	10	98	(24)	60
Segment income from continuing operations	(22)	(104)	(9)	(100)
Other Operations Segment [Member]
Segment Reporting Information [Line Items]
Premiums and fees, Mail order pharmacy revenues and Other revenues	42	45	86	88
Segment income from continuing operations	20	24	43	43
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Premiums and fees, Mail order pharmacy revenues and Other revenues	(14)	(15)	(29)	(30)
Segment income from continuing operations	(43)	(40)	(73)	(86)
Total Segments [Member]
Segment Reporting Information [Line Items]
Premiums and fees, Mail order pharmacy revenues and Other revenues	5,208	5,048	10,316	9,993
Segment income from continuing operations	$ 397	$ 280	$ 809	$ 566