Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended										12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Revenues
Net realized investment gains (losses)											$ (67)		$ 57		$ 20
Total revenues	$ 2,269		$ 2,153	$ 2,327	$ 2,352	$ 2,378	$ 2,411	$ 2,440	$ 2,463		9,101		9,692		9,932
Claims, Benefits and Expenses
Interest											155		183		166
Income tax expense (benefit)											(70)		(319)		(361)
Net income (loss)	$ (70)	[1]	$ 178	$ 138	$ 233	$ 198	$ 213	$ 267	$ 13	[2]	479	[1]	691	[2]	937
Total comprehensive income (loss)											(236)		649		548
Parent Company [Member]
Revenues
Net investment income											1		1		1
Net realized investment gains (losses)											5		4		4
Total revenues											6		5		5
Claims, Benefits and Expenses
Administrative and general											1		5		(7)
Interest											154		182		165
Total expenses											155		187		158
Income (loss) from operations before income taxes and equity in net income of subsidiaries											(149)		(182)		(153)
Income tax expense (benefit)											34		35		22
Income (loss) before equity in net income (loss) of subsidiaries											(115)		(147)		(131)
Equity in net income of subsidiaries											594		838		1,068
Net income (loss)											479		691		937
Equity in other comprehensive income of subsidiaries											(715)		(42)		(389)
Total comprehensive income (loss)											$ (236)		$ 649		$ 548

[1] Net income in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

[2] Net income in the first quarter of 2014 included the impairment loss on the sale of CAC.