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Segment Information (Reconciliation of Assets From Segments to Consolidated Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 281,763 | $ 261,627
Parent Company [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 23,716 | 21,020
Annuities Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 144,721 | 133,817
Retirement Plan Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 37,072 | 34,344
Life Insurance Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 81,381 | 76,083
Group Protection Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 4,033 | 4,007
Other Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 14,556 | $ 13,376

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