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Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Schedule Of Segment Reporting And Reconcilliation [Line Items] |  |
Total revenues | $ 3,500 | $ 3,243
Annuities Segment [Member] |  |
Schedule Of Segment Reporting And Reconcilliation [Line Items] |  |
Total revenues | 1,061 | 1,039
Retirement Plan Services Segment [Member] |  |
Schedule Of Segment Reporting And Reconcilliation [Line Items] |  |
Total revenues | 282 | 267
Life Insurance Segment [Member] |  |
Schedule Of Segment Reporting And Reconcilliation [Line Items] |  |
Total revenues | 1,606 | 1,478
Group Protection Segment [Member] |  |
Schedule Of Segment Reporting And Reconcilliation [Line Items] |  |
Total revenues | 541 | 534
Other Operations [Member] |  |
Schedule Of Segment Reporting And Reconcilliation [Line Items] |  |
Total revenues | 88 | 82
Excluded realized gain (loss) pre-tax [Member] |  |
Schedule Of Segment Reporting And Reconcilliation [Line Items] |  |
Total revenues | (80) | (158)
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 |

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- 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 + Details
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