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Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Comprehensive Income
Net income (loss)	$ 574	$ 1,120
Unrealized appreciation (decline) in value of available-for-sale investments:
Unrealized holding gains (losses) arising during period	234	(141)
Reclassification of net realized (gains) losses, included in net income (loss)	52	29
Foreign currency translation adjustments	26	(33)
Comprehensive income (loss) available to Arch	$ 886	$ 975

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