Unpaid Losses and Loss Expenses and Policy Benefits for Life and Annuity Contracts (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure - Unpaid Losses and Loss Expenses and Policy Benefits for Life and Annuity Contracts [Abstract]

Schedule Of Unpaid Losses And Loss Expenses By Type Table [Text Block]

		2012		2011
Case reserves	$	4,872,591	$	5,187,761
ACRs		354,382		495,593
IBNR reserves		5,482,398		5,589,737
Total unpaid losses and loss expenses	$	10,709,371	$	11,273,091

Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense [Text Block]

		2012		2011		2010
Gross liability at beginning of year	$	11,273,091	$	10,666,604	$	10,811,483
Reinsurance recoverable at beginning of year		353,105		348,747		336,352
Net liability at beginning of year		10,919,986		10,317,857		10,475,131
Net incurred losses related to:
Current year		2,785,694		4,252,766		3,137,874
Prior years		(628,065)		(530,457)		(477,883)
		2,157,629		3,722,309		2,659,991
Change in Paris Re Reserve Agreement		(86,163)		(61,383)		(66,783)
Net paid losses related to:
Current year		237,783		930,407		311,253
Prior years		2,467,279		2,060,152		2,267,765
		2,705,062		2,990,559		2,579,018
Effects of foreign exchange rate changes		131,651		(68,238)		(171,464)
Net liability at end of year		10,418,041		10,919,986		10,317,857
Reinsurance recoverable at end of year		291,330		353,105		348,747
Gross liability at end of year	$	10,709,371	$	11,273,091	$	10,666,604

Reconciliation Of Loss And Loss Expenses Including Life Policy Benefits Table [Text Block]

		2012		2011		2010
Net incurred losses related to:
Non-life	$	2,157,629	$	3,722,309	$	2,659,991
Life		646,981		650,261		623,627
Losses and loss expenses and life policy benefits	$	2,804,610	$	4,372,570	$	3,283,618

Net Non Life Prior Year Loss Development Table [Text Block]

			2012		2011		2010
Net favorable prior year loss development:
Non-life sub-segment
	North America	$	218,483	$	189,180	$	165,780
	Global (Non-U.S.) P&C		114,279		115,995		97,539
	Global (Non-U.S.) Specialty		250,523		128,975		170,931
	Catastrophe		44,780		96,307		43,633
Total net favorable prior year loss development		$	628,065	$	530,457	$	477,883