Sale of Operations (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Sale of Operations (Textual) [Abstract]
Projected proceeds from sale of Medicare supplement and critical illness business	$ 295
Minimum [Member]
Sale of Operations [Line Items]
Projected pre-tax realized gain on sale of Medicare supplement and critical illness business	150
Maximum [Member]
Sale of Operations [Line Items]
Projected pre-tax realized gain on sale of Medicare supplement and critical illness business	$ 165