For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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+ Details

INVESTMENTS (DETAILS 9) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule Of Available For Sale Securities [Line Items]
Decrease in credit loss impairments due to sale of previously impaired securities	$ 55,784	$ 107,244
Realized gains on maturity	260,288	326,930	181,075
Fair Value (Fixed Maturities)	10,940,100	10,482,897
Non-US Government [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value (Fixed Maturities)	1,212,451	772,798
Non-US Government [Member] \| eurozone [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value (Fixed Maturities)	634,000	451,000
MTNs [Member]
Schedule Of Available For Sale Securities [Line Items]
Decrease in credit loss impairments due to sale of previously impaired securities	52,000	85,000
Realized gains on maturity	15,000	29,000
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value (Fixed Maturities)	3,609,591	4,162,908
Corporate Debt [Member] \| Weighted Average [Member]
Schedule Of Available For Sale Securities [Line Items]
Default rate input for determining credit loss		35.00%
Loss severity rate input for determining credit loss		100.00%
CMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value (Fixed Maturities)	312,691	474,785
CMBS [Member] \| Weighted Average [Member]
Schedule Of Available For Sale Securities [Line Items]
Estimated subordination percentage input for determining credit loss	25.00%	27.00%
Non-Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value (Fixed Maturities)	165,713	244,202
Non-Agency RMBS [Member] \| Prime [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value (Fixed Maturities)	128,000	174,000
Non-Agency RMBS [Member] \| Alt A [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value (Fixed Maturities)	23,000	52,000
CLO - Debt Tranched Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Default rate input for determining credit loss	4.00%	3.80%
Loss severity rate input for determining credit loss	53.50%	65.00%
Fair Value (Fixed Maturities)	$ 48,000	$ 43,000
CLO - Debt Tranched Securities [Member] \| Minimum [Member]
Schedule Of Available For Sale Securities [Line Items]
Collateral spread input for determining credit loss	2.60%	2.90%
CLO - Debt Tranched Securities [Member] \| Maximum [Member]
Schedule Of Available For Sale Securities [Line Items]
Collateral spread input for determining credit loss	3.80%	3.70%