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, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Revenues
Net realized investment gains (losses)													$ 57		$ 20	$ 54
Other revenues													356		359	319
Total revenues	2,378		2,411		2,440		2,463		2,569	2,458	2,450	2,455	9,692		9,932	9,364
Claims, Benefits and Expenses
Interest													183		166	170
Income tax expense (benefit)													(319)		(361)	(239)
Net income (loss)	198	[1]	213	[1]	267	[1]	13	[1]	221	272	194	250	691	[1]	937	628
Total comprehensive income (loss)													649		548	979
Parent Company [Member]
Revenues
Net investment income													1		1	1
Net realized investment gains (losses)													4		4	4
Other revenues																9
Total revenues													5		5	14
Claims, Benefits and Expenses
Administrative and general													5		(7)	1
Interest													182		165	164
Total expenses													187		158	165
Income (loss) from operations before income taxes and equity in net income of subsidiaries													(182)		(153)	(151)
Income tax expense (benefit)													35		22	144
Income (loss) before equity in net income (loss) of subsidiaries													(147)		(131)	(7)
Equity in net income of subsidiaries													838		1,068	635
Net income (loss)													691		937	628
Equity in other comprehensive income of subsidiaries													(42)		(389)	351
Total comprehensive income (loss)													$ 649		$ 548	$ 979

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