Condensed Financial Information of Parent Company (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues
Investment Income									$ 1,644	$ 1,665	$ 1,649
Other Revenues									9	13	13
Realized Investment Gains, Net									288	426	23
Total Revenues	3,345	3,420	3,400	3,420	3,411	3,267	3,318	3,323	13,585	13,319	13,016
Expenses
Corporate Expenses									287	290	294
Investment Expenses									39	35	39
Other Expenses									11	15	16
Federal and Foreign Income Tax (Credit)	150	68	127	176	234	212	184	184	521	814	779
NET INCOME	452	298	419	509	620	572	518	464	1,678	2,174	2,183
Parent Company [Member]
Revenues
Investment Income									46	76	64
Other Revenues									0	2	0
Realized Investment Gains, Net									9	16	88
Total Revenues									55	94	152
Expenses
Corporate Expenses									285	288	292
Investment Expenses									3	3	3
Other Expenses									0	3	0
Total expenses									288	294	295
Loss before Federal and Foreign Income Tax and Equity in Net Income of Consolidated Subsidiaries									(233)	(200)	(143)
Federal and Foreign Income Tax (Credit)									1	(3)	(7)
Loss before Equity in Net Income of Consolidated Subsidiaries									(234)	(197)	(136)
Equity in Net Income of Consolidated Subsidiaries									1,912	2,371	2,319
NET INCOME									$ 1,678	$ 2,174	$ 2,183