Insurance in Force (Schedule Of Geographical Distribution Of Insurance In Force) (Detail) - USD ($) $ in Billions	Dec. 31, 2018	Dec. 31, 2017
Insurance in Force	$ 128.1	$ 154.9
% of Insurance in Force	100.00%	100.00%
California [Member]
Insurance in Force	$ 25.9	$ 30.3
% of Insurance in Force	20.20%	19.60%
Illinois [Member]
Insurance in Force	$ 11.1	$ 13.1
% of Insurance in Force	8.70%	8.50%
New York [Member]
Insurance in Force	$ 5.9	$ 9.3
% of Insurance in Force	4.60%	6.00%
Puerto Rico [Member]
Insurance in Force	$ 7.9	$ 8.2
% of Insurance in Force	6.20%	5.30%
New Jersey [Member]
Insurance in Force	$ 6.8	$ 7.6
% of Insurance in Force	5.30%	4.90%
Texas [Member]
Insurance in Force	$ 4.3	$ 6.1
% of Insurance in Force	3.40%	3.90%
Hawaii [Member]
Insurance in Force	$ 4.3	$ 4.5
% of Insurance in Force	3.40%	2.90%
Virginia [Member]
Insurance in Force	$ 3.7	$ 4.2
% of Insurance in Force	2.90%	2.70%
Florida [Member]
Insurance in Force	$ 3.1	$ 3.8
% of Insurance in Force	2.40%	2.50%
Oregon [Member]
Insurance in Force	$ 3.2	$ 3.6
% of Insurance in Force	2.50%	2.30%
Sub-Total Insurance In Force [Member]
Insurance in Force	$ 76.2	$ 90.7
% of Insurance in Force	59.60%	58.60%
Nationally Diversified [Member]
Insurance in Force	$ 13.5	$ 15.7
% of Insurance in Force	10.50%	10.10%
Other States [Member]
Insurance in Force	$ 29.1	$ 37.0
% of Insurance in Force	22.70%	23.90%
United States [Member]
Insurance in Force	$ 118.8	$ 143.4
% of Insurance in Force	92.80%	92.60%
Internationally Diversified [Member]
Insurance in Force	$ 0.4	$ 0.4
% of Insurance in Force	0.30%	0.30%
Country Specific [Member]
Insurance in Force	$ 8.9	$ 11.1
% of Insurance in Force	6.90%	7.10%
Non-United States [Member]
Insurance in Force	$ 9.3	$ 11.5
% of Insurance in Force	7.20%	7.40%