Consolidated Statements Of Operations (Parenthetical) (Non Variable Interest Entities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Non Variable Interest Entities [Member]
Premiums earned, ceded premiums	$ 3	$ 3	$ 12	$ 9