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Investments (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended				3 Months Ended								1 Months Ended
	Mar. 31, 2014 Securities	Mar. 31, 2013	Dec. 31, 2013 Securities	Mar. 31, 2014 Fixed Maturity Securities [Member]	Mar. 31, 2013 Fixed Maturity Securities [Member]	Mar. 31, 2014 Other Asset Backed Securities [Member] Investments, External Credit Rating, Non Investment Grade [Member] Securities	Mar. 31, 2014 Residential Mortgage Backed Securities, Alt-A Sector [Member] Residential Mortgage Backed Securities [Member] Securities	Mar. 31, 2014 Available For Sale Securities [Member]	Mar. 31, 2013 Available For Sale Securities [Member]	Mar. 31, 2014 Available For Sale Securities [Member] Fixed Maturity Securities [Member]	Dec. 31, 2013 Available For Sale Securities [Member] Fixed Maturity Securities [Member]	Mar. 31, 2014 Available For Sale Securities [Member] Residential Mortgage Backed Securities [Member] Fixed Maturity Securities [Member]	Dec. 31, 2013 Available For Sale Securities [Member] Residential Mortgage Backed Securities [Member] Fixed Maturity Securities [Member]	Mar. 31, 2014 Available For Sale Securities [Member] Other Asset Backed Securities [Member] Fixed Maturity Securities [Member]	Dec. 31, 2013 Available For Sale Securities [Member] Other Asset Backed Securities [Member] Fixed Maturity Securities [Member]	Apr. 30, 2014 Subsequent Event [Member]
Investments [Abstract]
Fixed income securities with call features, percentage	31.00%
Fixed income securities with call features, currently callable, percentage	0.50%
Fixed income securities with call features, currently callable, amount	$ 100,000,000
Fixed income securities with call features, callable during next 12 months, percentage	5.00%
Fixed income securities with call features, callable during next 12 months, amount	1,200,000,000
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations	98.00%		98.00%
Number of individual securities with unrealized losses	665		1,047
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	93.00%		95.00%
Investment Holdings [Line Items]
Proceeds from calls of United States Government securities																500,000,000
Available for sale securities, number of securities in unrealized loss positions						0	36
Available for sale securities, amortized cost	27,255,625,000		26,527,730,000				301,100,000
Available for sale securities, fair value							324,200,000			28,315,473,000	26,610,447,000	1,928,555,000	1,971,960,000	1,045,052,000	1,034,476,000
Proceeds from sales of available for sale securities								56,100,000	380,400,000
Scheduled principal repayments, calls and tenders for available for sale securities	$ 208,747,000	$ 937,343,000		$ 152,700,000	$ 556,900,000

X

- Definition

Represents the amount of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are callable during the next 12 months.

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Represents the percentage of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are callable over the next 12 months.

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Represents the amount of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are currently callable.

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Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value.

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The cash inflow associated with the calls (requests for early payments) of US Government Agency and Corporate (public and private) securities classified as available for sale or held for investment.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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