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Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Comprehensive Income
Net income (loss)	$ 717	$ 198
Unrealized appreciation (decline) in value of available-for-sale investments:
Unrealized holding gains (losses) arising during period	245	(684)
Reclassification of net realized (gains) losses, included in net income (loss)	99	102
Foreign currency translation adjustments	5	(3)
Comprehensive income (loss)	1,066	(387)
Net (income) loss attributable to noncontrolling interests	(2)	(2)
Comprehensive income (loss) available to Arch	$ 1,064	$ (389)

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