Sales of Subsidiaries (Details) (Medicare supplement and critical illness businesses [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Medicare supplement and critical illness businesses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	$ 79	$ 159
Total costs and expenses	67	141
Earnings before income taxes	$ 12	$ 18