Insurance in Force (Schedule Of Geographical Distribution Of Insurance In Force) (Detail) (USD $) In Billions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Insurance in Force	$ 437.8	$ 554.3
% of Insurance in Force	100.00%	100.00%
California [Member]
Insurance in Force	73.8	88.7
% of Insurance in Force	16.90%	16.00%
New York [Member]
Insurance in Force	29.8	38.1
% of Insurance in Force	6.80%	6.90%
Illinois [Member]
Insurance in Force	25.4	29.6
% of Insurance in Force	5.80%	5.30%
Florida [Member]
Insurance in Force	24.1	29.2
% of Insurance in Force	5.50%	5.30%
Texas [Member]
Insurance in Force	21.1	28.0
% of Insurance in Force	4.80%	5.00%
New Jersey [Member]
Insurance in Force	16.8	20.2
% of Insurance in Force	3.90%	3.60%
Michigan [Member]
Insurance in Force	12.3	15.3
% of Insurance in Force	2.80%	2.80%
Pennsylvania [Member]
Insurance in Force	9.3	11.8
% of Insurance in Force	2.30%	2.10%
Washington [Member]
Insurance in Force	9.1	11.5
% of Insurance in Force	2.10%	2.10%
Puerto Rico [Member]
Insurance in Force	10.1	10.9
% of Insurance in Force	2.10%	2.00%
Sub-Total Insurance In Force [Member]
Insurance in Force	231.8	283.3
% of Insurance in Force	53.00%	51.10%
Nationally Diversified [Member]
Insurance in Force	38.9	53.6
% of Insurance in Force	8.90%	9.70%
Other States [Member]
Insurance in Force	123.6	155.8
% of Insurance in Force	28.20%	28.10%
United States [Member]
Insurance in Force	394.3	492.7
% of Insurance in Force	90.10%	88.90%
Internationally Diversified [Member]
Insurance in Force	2.8	12.8
% of Insurance in Force	0.60%	2.30%
Country Specific [Member]
Insurance in Force	40.7	48.8
% of Insurance in Force	9.30%	8.80%
Non-United States [Member]
Insurance in Force	$ 43.5	$ 61.6
% of Insurance in Force	9.90%	11.10%