Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	$ 3,122	$ 3,009	$ 2,999	$ 2,839	$ 2,973	$ 2,954	$ 2,898	$ 2,710	$ 11,969	$ 11,535	$ 10,641
Annuities [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									3,321	2,975	2,871
Retirement Plan Services [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									1,071	1,024	1,017
Life Insurance [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									5,170	5,056	4,740
Group Protection [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									2,260	2,091	1,938
Other Operations [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									417	423	461
Excluded realized gain (loss) pre-tax [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									(274)	(39)	(388)
Amortization of deferred gain arising from reserve changes on business sold through reinsurance, pre-tax [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									3	4	2
Amortization Of DFEL associated with benefit ratio unlocking, pre-tax [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									1	1
Parent Company [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues									$ 849	$ 783	$ 1,024