Represents the reasonable period of time from the date of impairment for a security to recover to book value.

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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 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 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).

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

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

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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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Threshold percentage utilized for disclosure purposes.

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Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

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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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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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This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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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 maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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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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Investments (Narrative) (Details) (USD $)	12 Months Ended
Investments (Narrative) (Details) (USD $)	Dec. 31, 2013 Securities	Dec. 31, 2012 Securities	Dec. 31, 2011
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	1,047	198
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	95.00%	75.00%
Assets held by insurance regulators	31,700,000,000	27,200,000,000
Investment Holdings [Line Items]
Proceeds from calls of United States Government sponsored agency securities	1,100,000,000	4,600,000,000
Available for sale, amortized cost	26,527,730,000	21,957,027,000
Principal repayments, calls and tenders of available for sale securities	3,456,719,000	3,298,623,000	3,705,605,000
Calls of held for investment fixed maturity securities	0	2,618,207,000	219,372,000
Stockholders' Equity, Total [Member]
Investment Holdings [Line Items]
Threshold for disclosure percentage	10.00%
Investment Type Concentration Risk [Member]
Investment Holdings [Line Items]
Fair value, concentration of risk, investments	0	0
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Principal repayments, calls and tenders of available for sale securities	2,100,000,000	2,800,000,000	3,400,000,000
Calls of held for investment fixed maturity securities		2,600,000,000	200,000,000
Equity Securities, Available For Sale [Member] \| Maximum [Member]
Investment Holdings [Line Items]
Available for sale securities, impairment, recovery of book value, reasonable period	18 months
Other Asset Backed Securities [Member] \| Investments, External Credit Rating, Non Investment Grade [Member]
Investment Holdings [Line Items]
Number of securities in unrealized loss position	0
Held For Investment [Member]
Investment Holdings [Line Items]
Proceeds from calls of United States Government sponsored agency securities		2,600,000,000
Residential Mortgage Backed Securities, Alt-A Sector [Member] \| Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Number of securities in unrealized loss position	36
Available for sale, amortized cost	310,600,000
Available for sale securities, fair value	328,000,000
Available For Sale [Member]
Investment Holdings [Line Items]
Proceeds from sales of available for sale securities	1,500,000,000	492,500,000	252,200,000
Available For Sale [Member] \| Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, fair value	26,610,447,000	24,172,136,000
Available For Sale [Member] \| Equity Securities, Available For Sale [Member]
Investment Holdings [Line Items]
Available for sale securities, fair value	7,778,000	53,422,000
Available For Sale [Member] \| Residential Mortgage Backed Securities [Member] \| Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, fair value	1,971,960,000	2,888,113,000
Available For Sale [Member] \| Other Asset Backed Securities [Member] \| Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Available for sale securities, fair value	$ 1,034,476,000	$ 998,508,000