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INVESTMENT OPERATIONS (Details 2) (USD $)
9 Months Ended
Sep. 30, 2011
Investment operations 
Amortized Cost$ 23,480,474,000
Gross Unrealized Gains2,185,902,000
Gross Unrealized Losses(478,836,000)
Fair Value25,187,540,000
Total OTTI Recognized in OCI(42,239,000)
Fixed maturities
 
Investment operations 
Amortized Cost23,140,742,000
Gross Unrealized Gains2,180,852,000
Gross Unrealized Losses(464,865,000)
Fair Value24,856,729,000
Total OTTI Recognized in OCI(42,166,000)
Trading securities3,000,000,000
Amortized Cost 
Due in one year or less586,074,000
Due after one year through five years4,591,736,000
Due after five years through ten years5,864,950,000
Due after ten years12,097,982,000
Total23,140,742,000
Fair Value 
Due in one year or less594,660,000
Due after one year through five years4,769,481,000
Due after five years through ten years6,274,144,000
Due after ten years13,218,444,000
Total24,856,729,000
Residential mortgage-backed securities
 
Investment operations 
Amortized Cost2,543,463,000
Gross Unrealized Gains100,445,000
Gross Unrealized Losses(110,718,000)
Fair Value2,533,190,000
Total OTTI Recognized in OCI(43,905,000)
Commercial mortgage-backed securities
 
Investment operations 
Amortized Cost463,075,000
Gross Unrealized Gains9,322,000
Gross Unrealized Losses(7,960,000)
Fair Value464,437,000
Other asset-backed securities
 
Investment operations 
Amortized Cost870,801,000
Gross Unrealized Gains2,769,000
Gross Unrealized Losses(72,811,000)
Fair Value800,759,000
U.S. government-related securities
 
Investment operations 
Amortized Cost1,244,622,000
Gross Unrealized Gains92,094,000
Gross Unrealized Losses(139,000)
Fair Value1,336,577,000
Other government-related securities
 
Investment operations 
Amortized Cost127,260,000
Gross Unrealized Gains6,507,000
Gross Unrealized Losses(800,000)
Fair Value132,967,000
States, municipals, and political subdivisions
 
Investment operations 
Amortized Cost1,148,313,000
Gross Unrealized Gains176,289,000
Fair Value1,324,602,000
Corporate bonds
 
Investment operations 
Amortized Cost16,743,208,000
Gross Unrealized Gains1,793,426,000
Gross Unrealized Losses(272,437,000)
Fair Value18,264,197,000
Total OTTI Recognized in OCI1,739,000
Equity securities
 
Investment operations 
Amortized Cost326,988,000
Gross Unrealized Gains5,050,000
Gross Unrealized Losses(13,971,000)
Fair Value318,067,000
Total OTTI Recognized in OCI(73,000)
Trading securities9,700,000
Short-term investments
 
Investment operations 
Amortized Cost12,744,000
Fair Value12,744,000
Trading securities$ 67,600,000