Summary of Significant Accounting Policies Participating Policies (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Weighted Average Discount Rates [Line Items]
Participating Policies Additional Income Allocated, Percent	61.30%	60.70%
Minimum [Member]
Weighted Average Discount Rates [Line Items]
Number of Years, Future Scaling Rate	1
Weighted Average Discount Rate, Percent	3.00%
Minimum [Member] | Two Years [Domain]
Weighted Average Discount Rates [Line Items]
Weighted Average Discount Rate Percent, Future Scaling Rate	4.10%
Maximum [Member]
Weighted Average Discount Rates [Line Items]
Number of Years, Future Scaling Rate	20
Weighted Average Discount Rate, Percent	9.00%
Maximum [Member] | Fifteen Years and After [Member]
Weighted Average Discount Rates [Line Items]
Weighted Average Discount Rate Percent, Future Scaling Rate	4.50%