Fair Value (The Fair Value Calculated Using An Industry Accepted Option Pricing Model, Black-Scholes) (Details)	Mar. 31, 2014 item
Standard & Poor's 500 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Index	1,872.3
Interest rate, range minimum	1.28%
Interest rate, range maximum	3.64%
Time to maturity, range minimum, years	3 years 1 month 6 days
Time to maturity, range maximum, years	17 years
Volatility, minimum	20.80%
Volatility, maximum	25.00%
FTSE 100 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Index	6,598.4
Interest rate	2.52%
Time to maturity, years	6 years 3 months 18 days
Volatility	23.20%