Goodwill and Other Intangibles (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 185		$ 185		$ 185
Amortizable intangible assets related to property and casualty insurance acquisitions	18		18		28
Accumulated amortization	71		71		61
Amortization of intangible assets	3	3	10	10
Non-amortizable intangible assets related to insurance licenses	$ 8		$ 8