Insurance in Force (Schedule Of Geographical Distribution Of Insurance In Force) (Detail) - USD ($) $ in Billions	Dec. 31, 2015	Dec. 31, 2014
Insurance in Force	$ 326.6	$ 437.8
% of Insurance in Force	100.00%	100.00%
California [Member]
Insurance in Force	$ 55.5	$ 73.8
% of Insurance in Force	17.00%	16.90%
New York [Member]
Insurance in Force	$ 23.4	$ 29.8
% of Insurance in Force	7.10%	6.80%
Illinois [Member]
Insurance in Force	$ 20.5	$ 25.4
% of Insurance in Force	6.30%	5.80%
Florida [Member]
Insurance in Force	$ 15.2	$ 24.1
% of Insurance in Force	4.70%	5.50%
Texas [Member]
Insurance in Force	$ 14.5	$ 21.1
% of Insurance in Force	4.40%	4.80%
New Jersey [Member]
Insurance in Force	$ 13.7	$ 16.8
% of Insurance in Force	4.20%	3.90%
Michigan [Member]
Insurance in Force	$ 8.3	$ 12.3
% of Insurance in Force	2.50%	2.80%
Pennsylvania [Member]
Insurance in Force	$ 6.4	$ 9.3
% of Insurance in Force	2.00%	2.10%
Puerto Rico [Member]
Insurance in Force	$ 9.0	$ 10.1
% of Insurance in Force	2.80%	2.30%
Colorado [Member]
Insurance in Force	$ 6.9	$ 8.5
% of Insurance in Force	2.10%	1.90%
Sub-Total Insurance In Force [Member]
Insurance in Force	$ 173.4	$ 231.2
% of Insurance in Force	53.10%	52.80%
Nationally Diversified [Member]
Insurance in Force	$ 28.9	$ 38.9
% of Insurance in Force	8.90%	8.90%
Other States [Member]
Insurance in Force	$ 88.0	$ 124.2
% of Insurance in Force	26.90%	28.40%
United States [Member]
Insurance in Force	$ 290.3	$ 394.3
% of Insurance in Force	88.90%	90.10%
Internationally Diversified [Member]
Insurance in Force	$ 1.1	$ 2.8
% of Insurance in Force	0.30%	0.60%
Country Specific [Member]
Insurance in Force	$ 35.2	$ 40.7
% of Insurance in Force	10.80%	9.30%
Non-United States [Member]
Insurance in Force	$ 36.3	$ 43.5
% of Insurance in Force	11.10%	9.90%