Insurance In Force (Schedule Of Geographical Distribution Of Insurance In Force) (Details) (USD $) In Billions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Insurance In Force [Line Items]
Insurance in Force	$ 840.1	$ 1,025.0
% of Insurance in Force	100.00%	100.00%
California [Member]
Insurance In Force [Line Items]
Insurance in Force	125.0	144.5
% of Insurance in Force	14.90%	14.10%
New York [Member]
Insurance In Force [Line Items]
Insurance in Force	62.3	73.4
% of Insurance in Force	7.40%	7.20%
Florida [Member]
Insurance In Force [Line Items]
Insurance in Force	47.9	58.0
% of Insurance in Force	5.70%	5.70%
Texas [Member]
Insurance In Force [Line Items]
Insurance in Force	41.7	49.7
% of Insurance in Force	5.00%	4.80%
Illinois [Member]
Insurance In Force [Line Items]
Insurance in Force	41.2	46.1
% of Insurance in Force	4.90%	4.50%
New Jersey [Member]
Insurance In Force [Line Items]
Insurance in Force	30.3	34.3
% of Insurance in Force	3.60%	3.40%
Washington [Member]
Insurance In Force [Line Items]
Insurance in Force	22.8	26.9
% of Insurance in Force	2.70%	2.60%
Michigan [Member]
Insurance In Force [Line Items]
Insurance in Force	21.1	24.3
% of Insurance in Force	2.50%	2.40%
Pennsylvania [Member]
Insurance In Force [Line Items]
Insurance in Force	18.5	24.8
% of Insurance in Force	2.20%	2.40%
Massachusetts [Member]
Insurance In Force [Line Items]
Insurance in Force	15.1	20.9
% of Insurance in Force	1.80%	2.00%
Sub-Total Insurance In Force [Member]
Insurance In Force [Line Items]
Insurance in Force	425.9	502.9
% of Insurance in Force	50.70%	49.10%
Nationally Diversified [Member]
Insurance In Force [Line Items]
Insurance in Force	102.4	147.7
% of Insurance in Force	12.20%	14.40%
Other States [Member]
Insurance In Force [Line Items]
Insurance in Force	224.2	268.5
% of Insurance in Force	26.70%	26.20%
United States [Member]
Insurance In Force [Line Items]
Insurance in Force	752.5	919.1
% of Insurance in Force	89.60%	89.70%
Internationally Diversified [Member]
Insurance In Force [Line Items]
Insurance in Force	28.9	36.9
% of Insurance in Force	3.40%	3.60%
Country Specific [Member]
Insurance In Force [Line Items]
Insurance in Force	58.7	69.0
% of Insurance in Force	7.00%	6.70%
Non-United States [Member]
Insurance In Force [Line Items]
Insurance in Force	$ 87.6	$ 105.9
% of Insurance in Force	10.40%	10.30%