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Investments Fixed Maturity Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	$ 39,743
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	679,050
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	4,655,968
Available-for-sale Securities, Debt Maturities, after Ten Years through Twenty Years, Amortized Cost Basis	5,608,423
Available-for-sale Securities, Debt Maturities, after Twenty Years, Amortized Cost	6,918,145
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost	17,901,329
Available-for-sale Debt Securities, Amortized Cost Basis	21,957,027
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	41,276
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	765,237
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	5,049,957
Available-for-sale Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value	6,134,359
Available-for-sale Securities, Debt Maturities, after Twenty Years, Fair Value	7,936,704
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value	19,927,533
Available-for-sale Securities, Debt Securities	24,172,136	18,464,109
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Ten Years Through Twenty Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Twenty Years, Net Carrying Amount	76,088
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Net Carrying Amount	76,088
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	76,088
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Twenty Years, Fair Value	61,521
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value	61,521
Held-to-maturity Securities, Debt Maturities, Fair Value	61,521
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, without Single Maturity Date, Amortized Cost	2,743,537
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	2,888,113
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	0
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, without Single Maturity Date, Amortized Cost	354,870
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	357,982
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	0
Asset-backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, without Single Maturity Date, Amortized Cost	957,291
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	998,508
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 0

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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