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Investments Schedule of Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investment Holdings [Line Items]
Percentage of Investment Grade Fixed Maturity Securities, at Fair Value	98.00%
Fair Value, Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
NAIC 1 Designation	$ 15,250,560	$ 15,486,571
NAIC 2 Designation	8,533,121	5,272,759
NAIC 3 Designation	387,222	315,406
NAIC 4 Designation	56,151	23,989
NAIC 5 Designation	0	5,756
NAIC 6 Designation	6,603	4,050
Fixed Maturity Securities	24,233,657	21,108,531
Amortized Cost Basis [Member]
Investment Holdings [Line Items]
NAIC 1 Designation	13,737,381	14,359,272
NAIC 2 Designation	7,838,186	4,894,739
NAIC 3 Designation	398,294	335,642
NAIC 4 Designation	53,879	26,674
NAIC 5 Designation	0	4,932
NAIC 6 Designation	5,375	3,226
Fixed Maturity Securities	$ 22,033,115	$ 19,624,485

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Investment securities with a single maturity date.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 1.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 2.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 3.

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No definition available.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 4.

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No definition available.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 5.

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No definition available.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 6.

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No definition available.

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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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