Fair Value (Assets and Liabilities Measured - Quantitative Information) (Details) - Level 3	Mar. 31, 2021	Dec. 31, 2020
Measurement Input, Mortality Rate | Minimum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.0003	0.0003
Measurement Input, Mortality Rate | Maximum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.1213	0.1213
Measurement Input, Lapse Rate | Minimum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.0025	0.0025
Measurement Input, Lapse Rate | Maximum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.1500	0.1500
Measurement Input, Utilization Rate | Minimum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.0000	0.0000
Measurement Input, Utilization Rate | Maximum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.2500	0.2500
Measurement Input, Withdrawal Rate | Minimum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.0025	0.0025
Measurement Input, Withdrawal Rate | Maximum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.1000	0.1000
Measurement Input, Long Term Equity Volatilities | Minimum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.1666	0.1666
Measurement Input, Long Term Equity Volatilities | Maximum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.2221	0.2221
Measurement Input, Entity Credit Risk | Minimum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.0025	0.0047
Measurement Input, Entity Credit Risk | Maximum
Fair Value, Option, Quantitative Disclosures
Embedded Derivative Liability, Measurement Input	0.0145	0.0197