Goodwill and Other Intangibles (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2010
Changes in the carrying value of goodwill by reporting segment
Goodwill, Beginning balance		$ 186	$ 185	$ 186
Goodwill, Sale of subsidiary	(1)	(1)
Goodwill, Ending balance		185	185	186
Property and Casualty [Member]
Changes in the carrying value of goodwill by reporting segment
Goodwill, Beginning balance		152	152	152
Goodwill, Sale of subsidiary		0
Goodwill, Ending balance		152	152	152
Annuity [Member]
Changes in the carrying value of goodwill by reporting segment
Goodwill, Beginning balance		34	33	34
Goodwill, Sale of subsidiary		(1)
Goodwill, Ending balance		$ 33	$ 33	$ 34