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Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Comprehensive Income
Net income (loss)	$ 988	$ 723	$ 3,377	$ 2,109
Unrealized appreciation (decline) in value of available-for-sale investments:
Unrealized holding gains (losses) arising during period	645	(190)	478	(118)
Portion of other-than-temporary impairment losses recognized in other comprehensive income	0	0	0	0
Reclassification of net realized (gains) losses, included in net income (loss)	(60)	96	22	344
Foreign currency translation adjustments	25	(40)	(24)	(33)
Comprehensive income (loss) available to Arch	$ 1,598	$ 589	$ 3,853	$ 2,302

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