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Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Total revenues | $ 4,425 | $ 3,965
Annuities Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,129 | 1,174
Retirement Plan Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 297 | 293
Life Insurance Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,821 | 1,700
Group Protection Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,224 | 1,138
Other Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 38 | 57
Segment Reconciling Items [Member] |  |
Segment Reporting Information [Line Items] |  |
Excluded realized gain (loss), pre-tax | (75) | (400)
Amortization of DFEL associated with benefit ratio unlocking, pre-tax | $ (9) | $ 3

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