Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	$ 3,176	$ 2,839
Annuities [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	909	777
Retirement Plan Services [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	271	260
Life Insurance [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	1,337	1,241
Group Protection [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	610	550
Other Operations [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	106	102
Excluded realized gain (loss) pre-tax [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	(58)	(91)
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	1	1
Amortization Of DFEL associated with benefit ratio unlocking, pre-tax [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues		$ (1)