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Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 4,020 | $ 3,577 | $ 7,629 | $ 7,077
Annuities Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,106 | 1,076 | 2,180 | 2,138
Retirement Plan Services Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 292 | 290 | 584 | 571
Life Insurance Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,680 | 1,655 | 3,340 | 3,260
Group Protection Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 937 | 541 | 1,490 | 1,082
Other Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 58 | 67 | 125 | 155
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Excluded realized gain (loss), pre-tax | $ (53) | $ (52) | (89) | (132)
Amortization of deferred gain arising from reserve changes on business sold through reinsurance, pre-tax |  |  |  | 1
Amortization of DFEL associated with benefit ratio unlocking, pre-tax |  |  | $ (1) | $ 2

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