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Fair Values of Financial Instruments (Assumptions Used in Estimating Fair Value) (Details) - Fixed Index Annuities [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
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
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
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
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
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
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
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
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
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
Weighted Average [Member] | Contract Duration (Years), Group 1 [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	1.58%	1.60%
Average partial withdrawal rates	3.08%	3.07%
Weighted Average [Member] | Contract Duration (Years), Group 2 [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	8.55%	8.14%
Average partial withdrawal rates	3.55%	3.54%
Weighted Average [Member] | Contract Duration (Years), Group 3 [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	12.01%	11.58%
Average partial withdrawal rates	3.59%	3.56%
Weighted Average [Member] | Contract Duration (Years), Group 4 [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	12.99%	12.25%
Average partial withdrawal rates	3.22%	3.31%
Weighted Average [Member] | Contract Duration (Years), Group 5 [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Average lapse rates	12.54%	11.94%
Average partial withdrawal rates	3.22%	3.31%

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+ References

No definition available.

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Anticipated rate for an assumption not otherwise specified in the taxonomy, 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 80
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473

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 20
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389

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