Segment Information (Details) (Textual) (Personal Lines [Member], USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Personal Lines [Member]
Supplementary Insurance Information, by Segment [Line Items]
AARP earned premiums	$ 687	$ 712	$ 2,100	$ 2,100