Goodwill and Other Intangibles (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impairment charge		$ (22)			$ (22)
Goodwill decrease due to the sale of a small annuity subsidiary	(1)		(1)
Amortizable intangible assets related to property and casualty insurance acquisitions			28	41
Accumulated amortization			61	47
Amortization of intangible assets			14	12	12
Weighted average amortization period			2 years
Future amortization of intangibles, year 2013			14
Future amortization of intangibles, year 2014			13
Future amortization of intangibles, year 2015			1
Non-amortizable intangible assets related to insurance licenses			$ 8