Segment Information (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Information (Additional Textual) [Abstract]
Number of company reporting segments	9
Number of company reporting divisions	4
Personal Lines [Member]
Segment Information (Textual) [Abstract]
AARP earned premiums	$ 676	$ 698