Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	$ 3,307	$ 3,381	$ 6,551	$ 6,685
Annuities Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	983	991	2,022	1,981
Retirement Plan Services Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	270	270	537	543
Life Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	1,538	1,443	3,016	2,874
Group Protection Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	525	617	1,059	1,222
Other Operations [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	79	96	161	191
Excluded realized gain (loss) pre-tax [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	(89)	(37)	(245)	(127)
Amortization of deferred gain (loss) on reinsurance related to reserve changes, tax, reconciling item [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total revenues	$ 1	$ 1	$ 1	$ 1