UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss) attributable to XL Group plc	$ 171,902	$ 42,398	$ 569,686	$ 40,777
Change in net unrealized gains (losses) on investments, net of tax	456,642	110,124	778,299	291,330
Change in net unrealized gains (losses) on affiliate and other investments, net of tax	14,615	2,954	30,998	35,620
Change in OTTI losses recognized in other comprehensive income, net of tax	25,936	3,995	52,353	28,119
Change in underfunded pension liability	(2,026)	1,684	(2,033)	1,287
Change in value of cash flow hedge	110	110	330	330
Foreign currency translation adjustments	17,411	(85,635)	(19,563)	(1,278)
Comprehensive income (loss)	$ 684,590	$ 75,630	$ 1,410,070	$ 396,185