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Investments (Detail) - Contractual maturities of available for sale fixed income securities (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Fixed maturities - AFS  
Due less than one year$ 1,920,273[1]$ 1,552,612[1]
Due less than one year1,918,659[1]1,546,050[1]
Due after 1 through 5 years8,392,810[1]8,807,515[1]
Due after 1 through 5 years8,582,509[1]8,936,246[1]
Due after 5 through 10 years3,471,196[1]3,733,842[1]
Due after 5 through 10 years3,653,936[1]3,857,055[1]
Due after 10 years3,758,823[1]3,877,035[1]
Due after 10 years3,804,840[1]3,710,043[1]
[AvailableForSaleSecuritiesDebtMaturitiesInFutureYearsAmortizedCost]17,543,102[1]17,971,004[1]
[AvailableForSaleSecuritiesDebtMaturitiesInFutureYearsValue]17,959,944[1]18,049,394[1]
Available for sale fixed income securities, Amortized Cost26,750,242[1]27,322,842[1]
Available for sale fixed income securities, Fair Value27,005,350[1]27,142,105[1]
Fixed maturities - HTM  
Due less than one year11,263[1] [1]
Due less than one year11,237[1] [1]
Due after 1 through 5 years124,921[1]125,449[1]
Due after 1 through 5 years125,889[1]125,416[1]
Due after 5 through 10 years393,059[1]348,797[1]
Due after 5 through 10 years400,583[1]346,494[1]
Due after 10 years1,830,362[1]1,884,217[1]
Due after 10 years1,978,660[1]1,901,032[1]
[HeldToMaturitySecuritiesDebtMaturitiesInFutureYearsAmortizedCost]2,359,605[1]2,358,463[1]
[HeldToMaturitySecuritiesDebtMaturitiesInFutureYearsFairValue]2,516,369[1]2,372,942[1]
Held to maturity securities, Amortized Cost2,725,623[1]2,728,335[1]
Held to maturity securities, Fair Value2,901,434[1]2,742,626[1]
Residential Mortgage-Backed Securities Agency [Member]
  
Fixed maturities - AFS  
Available for sale fixed income securities, Amortized Cost5,385,140[1]5,059,249[1]
Available for sale fixed income securities, Fair Value5,595,139[1]5,203,711[1]
Residential Mortgage-Backed Securities Non-Agency [Member]
  
Fixed maturities - AFS  
Available for sale fixed income securities, Amortized Cost889,949[1]1,257,474[1]
Available for sale fixed income securities, Fair Value682,981[1]1,021,823[1]
Fixed maturities - HTM  
Held to maturity securities, Amortized Cost81,923[1]82,763[1]
Held to maturity securities, Fair Value86,539[1]82,851[1]
Commercial Mortgage Backed Securities [Member]
  
Fixed maturities - AFS  
Available for sale fixed income securities, Amortized Cost978,131[1]1,135,075[1]
Available for sale fixed income securities, Fair Value1,016,886[1]1,172,507[1]
Collateralized Debt Obligations [Member]
  
Fixed maturities - AFS  
Available for sale fixed income securities, Amortized Cost871,407[1]920,501[1]
Available for sale fixed income securities, Fair Value673,575[1]734,138[1]
Other Asset Backed Securities [Member]
  
Fixed maturities - AFS  
Available for sale fixed income securities, Amortized Cost1,082,513[1]979,539[1]
Available for sale fixed income securities, Fair Value1,076,825[1]960,532[1]
Fixed maturities - HTM  
Held to maturity securities, Amortized Cost284,095[1]287,109[1]
Held to maturity securities, Fair Value298,526[1]286,833[1]
Mortgage and Asset Backed Securities [Member]
  
Fixed maturities - AFS  
Available for sale fixed income securities, Amortized Cost9,207,140[1]9,351,838[1]
Available for sale fixed income securities, Fair Value9,045,406[1]9,092,711[1]
Fixed maturities - HTM  
Held to maturity securities, Amortized Cost366,018[1]369,872[1]
Held to maturity securities, Fair Value$ 385,065[1]$ 369,684[1]
[1]Included in the table above are Tier One and Upper Tier Two securities, representing committed term debt and hybrid instruments, which are senior to the common and preferred equities of the financial institutions, at their fair value of $485.6 million and $757.8 million at September 30, 2011 and December 31, 2010, respectively. These securities are reflected in the table based on their call date and have net unrealized losses of $167.6 million and $143.7 million at September 30, 2011 and December 31, 2010, respectively.