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Nature Of Operations, Basis of Presentation And Summary Of Significant Accounting Policies (Details) item in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Product Information [Line Items] |  |  |
Grace Period Expiration (In Days) | 10 days |  |
Loans Reported As Delinquent In Days | 60 days |  |
Period In Which Loans No Longer Accrue Interest In Days | 90 days |  |
Front End Load Annuity Products Assumed Life (In Years) | 25 years |  |
Useful Life of Sales Force Intangible Assets (In Years) | 25 years |  |
Number Of Scenarios Used Per Policy To Value A Block Of Guarantees | 100 |  |
Total Scenarios To Value GLB liability | item | 49 |  |
Dividend Expenses | $ | $ 57 | $ 59 | $ 67
Maximum [Member] |  |  |
Product Information [Line Items] |  |  |
Estimated Contract Life UL Policies (In Years) | 40 years |  |
Estimated Contract Life VUL Policies (In Years) | 40 years |  |
Estimated Contract Life Fixed and Variable Deferred Annuities (In Years) | 30 years |  |
Traditional Contract Acquisition Cost Amortization Period (In Years) | 30 years |  |
Interest Crediting Rate | 10.00 | 10.00 | 10.00
Minimum [Member] |  |  |
Product Information [Line Items] |  |  |
Estimated Contract Life UL Policies (In Years) | 30 years |  |
Estimated Contract Life VUL Policies (In Years) | 30 years |  |
Estimated Contract Life Fixed and Variable Deferred Annuities (In Years) | 15 years |  |
Interest Crediting Rate | 1.00 | 1.00 | 1.00
Life Insurance Segment [Member] | Maximum [Member] |  |  |
Product Information [Line Items] |  |  |
Investment Yield Assumptions for Traditional Direct Individual Life Reserves | 7.75% |  |
Life Insurance Segment [Member] | Minimum [Member] |  |  |
Product Information [Line Items] |  |  |
Investment Yield Assumptions for Traditional Direct Individual Life Reserves | 2.25% |  |
Annuities Segment [Member] | Maximum [Member] |  |  |
Product Information [Line Items] |  |  |
Investment Yield Assumptions for Immediate and Deferred Paid-Up Annuities | 12.75% |  |
Annuities Segment [Member] | Minimum [Member] |  |  |
Product Information [Line Items] |  |  |
Investment Yield Assumptions for Immediate and Deferred Paid-Up Annuities | 1.25% |  |

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