Goodwill and Other Intangibles - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the goodwill balance during the period			$ 0
Goodwill	$ 199,000,000		199,000,000		$ 199,000,000
Amortizable intangible assets related to property and casualty insurance acquisitions	36,000,000		36,000,000		41,000,000
Accumulated amortization	23,000,000		23,000,000		$ 18,000,000
Amortization of intangible assets	$ 2,000,000	$ 2,000,000	$ 6,000,000	$ 6,000,000