Quarterly Operating Results (Unaudited) (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended								12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013 Property and Casualty Insurance [Member]	Sep. 30, 2012 Property and Casualty Insurance [Member]	Dec. 31, 2012 Medicare Supplement and Critical Illness [Member]	Sep. 30, 2012 Medicare Supplement and Critical Illness [Member]	Sep. 30, 2013 Former Railroad and Manufacturing Operations [Member]	Dec. 31, 2012 Settlement with Taxing Authority [Member]	Sep. 30, 2012 Settlement with Taxing Authority [Member]	Dec. 31, 2012 Run-off Long-term Care and Life [Member]	Dec. 31, 2013 Run-off Long-term Care and Life [Member]
Quarterly Operating Results (Unaudited) [Line Items]
Special charges to increase asbestos and environmental reserves					$ 54	$ 31			$ 22
Realized gains (losses) on subsidiaries		(4)	161	(3)			15	155
Tax benefit related to settlement of litigation										39	28
Pretax charge on closed block of long-term care insurance												153	0
Pretax catastrophe losses	33
Pretax charge due to review of major actuarial assumptions in the annuity business	$ 14