Summary of Significant Accounting Policies Participating Policies (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Future Policy benefits on Participating Policies [Line Items]
Participating Policies Additional Income Allocated, Percent	60.80%	62.20%
Minimum [Member]
Future Policy benefits on Participating Policies [Line Items]
Future Policy Benefits on Participating Policies, Weighted Average Interest Rate	3.20%
Number of Years, Future Scaling Rate	1
Minimum [Member] | One Year [Domain] [Domain]
Future Policy benefits on Participating Policies [Line Items]
Weighted Average Discount Rate Percent, Future Scaling Rate	3.25%
Maximum [Member]
Future Policy benefits on Participating Policies [Line Items]
Future Policy Benefits on Participating Policies, Weighted Average Interest Rate	9.00%
Number of Years, Future Scaling Rate	20
Maximum [Member] | Twenty Years and After [Member]
Future Policy benefits on Participating Policies [Line Items]
Weighted Average Discount Rate Percent, Future Scaling Rate	4.36%