Sales of Subsidiaries (Details Textual) (Medicare supplement and critical illness businesses [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	Aug. 31, 2012
Medicare supplement and critical illness businesses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale proceeds	$ 326
Pretax gain on sale of subsidiaries	$ 170