Insurance in Force (Schedule Of Geographical Distribution Of Insurance In Force) (Detail) - USD ($) $ in Billions	Dec. 31, 2023	Dec. 31, 2022
Insurance in Force	$ 60.9	$ 68.0
% of Insurance in Force	100.00%	100.00%
California [Member]
Insurance in Force	$ 13.4	$ 14.8
% of Insurance in Force	22.00%	21.80%
Illinois [Member]
Insurance in Force	$ 6.6	$ 7.5
% of Insurance in Force	10.80%	11.00%
New Jersey [Member]
Insurance in Force	$ 3.8	$ 4.1
% of Insurance in Force	6.20%	6.10%
Hawaii [Member]
Insurance in Force	$ 3.6	$ 3.8
% of Insurance in Force	6.00%	5.60%
Virginia [Member]
Insurance in Force	$ 3.4	$ 3.6
% of Insurance in Force	5.60%	5.20%
Texas [Member]
Insurance in Force	$ 2.7	$ 2.9
% of Insurance in Force	4.40%	4.20%
New York [Member]
Insurance in Force	$ 1.5	$ 2.0
% of Insurance in Force	2.50%	2.90%
Oregon [Member]
Insurance in Force	$ 1.7	$ 2.0
% of Insurance in Force	2.80%	3.00%
Colorado [Member]
Insurance in Force	$ 1.7	$ 1.8
% of Insurance in Force	2.80%	2.70%
Georgia [Member]
Insurance in Force	$ 1.5	$ 1.6
% of Insurance in Force	2.40%	2.40%
Sub-Total Insurance In Force [Member]
Insurance in Force	$ 39.9	$ 44.1
% of Insurance in Force	65.50%	64.90%
Nationally Diversified [Member]
Insurance in Force	$ 6.7	$ 7.3
% of Insurance in Force	11.10%	10.70%
Other States [Member]
Insurance in Force	$ 11.8	$ 13.7
% of Insurance in Force	19.40%	20.10%
United States [Member]
Insurance in Force	$ 58.4	$ 65.1
% of Insurance in Force	96.00%	95.70%
Internationally Diversified [Member]
Insurance in Force	$ 0.2	$ 0.2
% of Insurance in Force	0.30%	0.40%
Country Specific [Member]
Insurance in Force	$ 2.3	$ 2.7
% of Insurance in Force	3.70%	3.90%
Non-United States [Member]
Insurance in Force	$ 2.5	$ 2.9
% of Insurance in Force	4.00%	4.30%