Label	Element	Value
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Reclassification Out of AOCI	xlgroup_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofAdoptionReclassificationOutofAOCI	$ 0
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Reclassification Out of AOCI	xlgroup_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofAdoptionReclassificationOutofAOCI	0
Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Reclassification Out of AOCI	xlgroup_NewAccountingPronouncementorChangeinAccountingPrincipleEffectofAdoptionReclassificationOutofAOCI	$ 0