Insurance in Force (Schedule Of Geographical Distribution Of Insurance In Force) (Detail) - USD ($) $ in Billions	Dec. 31, 2019	Dec. 31, 2018
Insurance in Force	$ 107.5	$ 128.1
% of Insurance in Force	100.00%	100.00%
California [Member]
Insurance in Force	$ 22.4	$ 25.9
% of Insurance in Force	20.90%	20.20%
Illinois [Member]
Insurance in Force	$ 10.2	$ 11.1
% of Insurance in Force	9.50%	8.70%
New York [Member]
Insurance in Force	$ 4.7	$ 5.9
% of Insurance in Force	4.40%	4.60%
Puerto Rico [Member]
Insurance in Force	$ 3.3	$ 7.9
% of Insurance in Force	3.10%	6.20%
New Jersey [Member]
Insurance in Force	$ 6.0	$ 6.8
% of Insurance in Force	5.60%	5.30%
Texas [Member]
Insurance in Force	$ 4.0	$ 4.3
% of Insurance in Force	3.70%	3.40%
Hawaii [Member]
Insurance in Force	$ 4.2	$ 4.3
% of Insurance in Force	3.90%	3.40%
Virginia [Member]
Insurance in Force	$ 3.6	$ 3.7
% of Insurance in Force	3.30%	2.90%
Oregon [Member]
Insurance in Force	$ 2.9	$ 3.2
% of Insurance in Force	2.70%	2.50%
Sub-Total Insurance In Force [Member]
Insurance in Force	$ 64.1	$ 76.1
% of Insurance in Force	59.70%	59.50%
Nationally Diversified [Member]
Insurance in Force	$ 11.8	$ 13.5
% of Insurance in Force	11.00%	10.50%
Other States [Member]
Insurance in Force	$ 23.5	$ 29.2
% of Insurance in Force	21.80%	22.80%
United States [Member]
Insurance in Force	$ 99.4	$ 118.8
% of Insurance in Force	92.50%	92.80%
Internationally Diversified [Member]
Insurance in Force	$ 0.3	$ 0.4
% of Insurance in Force	0.30%	0.30%
Country Specific [Member]
Insurance in Force	$ 7.8	$ 8.9
% of Insurance in Force	7.20%	6.90%
Non United States [Member]
Insurance in Force	$ 8.1	$ 9.3
% of Insurance in Force	7.50%	7.20%
COLORADO
Insurance in Force	$ 2.8	$ 3.0
% of Insurance in Force	2.60%	2.40%