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Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 3,511	$ 3,525	$ 10,588	$ 10,076
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,073	1,000	3,211	3,023
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	291	282	863	819
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,614	1,630	4,874	4,646
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	564	534	1,646	1,593
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	65	84	220	244
Excluded realized gain (loss), pre-tax [Member]
Segment Reporting Information [Line Items]
Total revenues	(97)	(7)	(229)	(252)
Amortization of deferred gain arising from reserve changes on business sold through reinsurance, pre-tax [Member]
Segment Reporting Information [Line Items]
Total revenues		1	1	2
Amortization Of DFEL Associated With Benefit Ratio Unlocking, Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1	$ 1	$ 2	$ 1

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

No definition available.

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