Aquisitions and Sales of Subsidiaries (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended	3 Months Ended
	Sep. 30, 2012	Aug. 31, 2012 Medicare supplement and critical illness businesses [Member]	Sep. 30, 2012 Small Annuity and Supplemental Insurance Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale proceeds		$ 307	$ 7
Pretax gain on sale of subsidiaries		155
Percentage of interest acquired in a subsidiary	28.00%
Purchase of interest not already owned in a subsidiary	$ 17