Investments Fixed Maturity Securities Stratified by Credit Quality (Details)		Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Credit Quality Indicator [Line Items]
Debt Securities, Held-to-maturity, by Credit Quality	[1]	100.00%	100.00%
Debt Securities, by Credit Quality	[1]	100.00%	100.00%
Blend, Aaa Rating [Member]
Debt Securities, Credit Quality Indicator [Line Items]
Debt Securities, Held-to-maturity, by Credit Quality	[1]	39.50%	39.50%
Debt Securities, by Credit Quality	[1]	23.70%	23.90%
Blend, Aa Rating [Member]
Debt Securities, Credit Quality Indicator [Line Items]
Debt Securities, Held-to-maturity, by Credit Quality	[1]	52.50%	52.50%
Debt Securities, by Credit Quality	[1]	12.90%	13.10%
Blend, A Rating [Member]
Debt Securities, Credit Quality Indicator [Line Items]
Debt Securities, Held-to-maturity, by Credit Quality	[1]	8.00%	8.00%
Debt Securities, by Credit Quality	[1]	32.10%	32.60%
Blend, Baa Rating [Member]
Debt Securities, Credit Quality Indicator [Line Items]
Debt Securities, Held-to-maturity, by Credit Quality	[1]	0.00%	0.00%
Debt Securities, by Credit Quality	[1]	26.60%	26.10%
Blend, Investment Grade [Member]
Debt Securities, Credit Quality Indicator [Line Items]
Debt Securities, Held-to-maturity, by Credit Quality	[1]	100.00%	100.00%
Debt Securities, by Credit Quality	[1]	95.30%	95.70%
Blend, Non-investment Grade [Member]
Debt Securities, Credit Quality Indicator [Line Items]
Debt Securities, Held-to-maturity, by Credit Quality	[1],[2]	0.00%	0.00%
Debt Securities, by Credit Quality	[1],[2]	4.70%	4.30%

[1] Credit quality ratings referred to herein are a blend of those assigned by the major credit rating agencies for U.S. and Canadian Governments, Agencies, Corporates and Municipal issuers.

[2] "All other" includes non-investment grade or non-rated issuers.