UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income (loss) attributable to XL Group plc	$ 221,156	$ 225,663	$ 397,784	$ (1,621)
Change in net unrealized gains (losses) on investments, net of tax	109,333	167,827	321,657	181,206
Change in net unrealized gains (losses) on affiliate and other investments, net of tax	1,333	8,431	16,383	32,666
Change in OTTI losses recognized in other comprehensive income, net of tax	13,996	(1,183)	26,417	24,124
Change in underfunded pension liability	167	(53)	(7)	(397)
Change in value of cash flow hedge	110	110	220	220
Foreign currency translation adjustments	(45,695)	72,741	(36,974)	84,357
Comprehensive income (loss)	$ 300,400	$ 473,536	$ 725,480	$ 320,555