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Fair Values of Financial Instruments (Assumptions Used in Estimating Fair Value) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Expected cost of annual call options | 3.10% | 3.10%
Mortality rate assumption | 65.00% |
Fixed Index Annuities [Member] | Minimum [Member] | Contract Duration (Years), Group 1 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 1 year | 1 year
Fixed Index Annuities [Member] | Minimum [Member] | Contract Duration (Years), Group 2 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 6 years | 6 years
Fixed Index Annuities [Member] | Minimum [Member] | Contract Duration (Years), Group 3 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 11 years | 11 years
Fixed Index Annuities [Member] | Minimum [Member] | Contract Duration (Years), Group 4 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 16 years | 16 years
Fixed Index Annuities [Member] | Minimum [Member] | Contract Duration (Years), Group 5 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 20 years | 20 years
Fixed Index Annuities [Member] | Maximum [Member] | Contract Duration (Years), Group 1 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 5 years | 5 years
Fixed Index Annuities [Member] | Maximum [Member] | Contract Duration (Years), Group 2 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 10 years | 10 years
Fixed Index Annuities [Member] | Maximum [Member] | Contract Duration (Years), Group 3 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 15 years | 15 years
Fixed Index Annuities [Member] | Maximum [Member] | Contract Duration (Years), Group 4 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Contract duration (years) | 20 years | 20 years
Fixed Index Annuities [Member] | Average [Member] | Contract Duration (Years), Group 1 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 1.83% | 1.76%
Average partial withdrawal rates | 3.32% | 3.30%
Fixed Index Annuities [Member] | Average [Member] | Contract Duration (Years), Group 2 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 7.01% | 6.58%
Average partial withdrawal rates | 3.32% | 3.30%
Fixed Index Annuities [Member] | Average [Member] | Contract Duration (Years), Group 3 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 11.31% | 11.25%
Average partial withdrawal rates | 3.34% | 3.32%
Fixed Index Annuities [Member] | Average [Member] | Contract Duration (Years), Group 4 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 11.96% | 12.04%
Average partial withdrawal rates | 3.20% | 3.18%
Fixed Index Annuities [Member] | Average [Member] | Contract Duration (Years), Group 5 [Member] |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Average lapse rates | 11.62% | 11.68%
Average partial withdrawal rates | 3.20% | 3.18%

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Anticipated rate of future terminations of contracts in force as of the balance sheet date, which is included in determining the amount of the specified guaranteed benefit obligation as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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