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Investments (Narrative) (Details) (USD $)	1 Months Ended	6 Months Ended
	Apr. 30, 2014	Jun. 30, 2014 Securities	Jun. 30, 2013	Dec. 31, 2013 Securities
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		4.00%
Fixed income securities with call features, callable during next 12 months, amount		1,000,000,000
Proceeds from calls of United States Government securities	500,000,000
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations		98.00%		98.00%
Number of individual securities with unrealized losses		450		1,047
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade		89.00%		95.00%
Investment Holdings [Line Items]
Available for sale securities, amortized cost		27,540,945,000		26,527,730,000
Scheduled principal repayments, calls and tenders for available for sale securities		939,430,000	2,292,959,000
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Scheduled principal repayments, calls and tenders for available for sale securities		809,000,000	1,600,000,000
Other Asset Backed Securities [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
Investment Holdings [Line Items]
Available for sale securities, number of securities in unrealized loss positions		0
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, number of securities in unrealized loss positions		35
Available for sale securities, amortized cost		265,400,000
Available for sale securities, fair value		294,700,000
Available For Sale Securities [Member]
Investment Holdings [Line Items]
Proceeds from sales of available for sale securities		130,400,000	820,200,000
Available For Sale Securities [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, fair value		29,317,572,000		26,610,447,000
Available For Sale Securities [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, fair value		1,870,565,000		1,971,960,000
Available For Sale Securities [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, fair value		$ 1,040,551,000		$ 1,034,476,000

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.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- 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 currently callable.

+ References

No definition available.

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- Definition

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 currently callable.

+ References

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- Definition

This item represents the percentage of unrealized losses on fixed maturity securities that is on securities classified as investment grade.

+ References

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Represents the number of individual securities in an unrealized loss position as of the reporting date.

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- Definition

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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6516133



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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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