Segment Information (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Information (Additional Textual) [Abstract]
Number of company reporting segments			8
Number of company reporting divisions			4
Personal Lines [Member]
Segment Information (Textual) [Abstract]
AARP earned premiums	$ 679	$ 687	$ 2,000	$ 2,100