Segments of Operations (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 42,087		$ 39,171		$ 35,838
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Assets	11,717	[1]	12,163	[1]	11,740	[1]
Annuity [Member]
Segment Reporting Information [Line Items]
Assets	24,294		20,909		18,245
Run-off Long-term Care and Life [Member]
Segment Reporting Information [Line Items]
Assets	2,408		2,304		1,785
Medicare Supplement and Critical Illness [Member]
Segment Reporting Information [Line Items]
Assets	0	[2]	0	[2]	359	[2]
Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 3,668		$ 3,795		$ 3,709

[1] Not allocable to sub-segments.

[2] Sold in August 2012.