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Unaudited Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Comprehensive Income        
Net income (loss) $ 1,237 $ 1,269 $ 1,811 $ 2,389
Unrealized appreciation (decline) in value of available-for-sale investments:        
Unrealized holding gains (losses) arising during period 303 (26) 537 (167)
Reclassification of net realized (gains) losses, included in net income (loss) (7) 53 45 82
Foreign currency translation adjustments 64 (16) 90 (49)
Comprehensive income (loss) available to Arch $ 1,597 $ 1,280 $ 2,483 $ 2,255