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Unaudited Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Comprehensive Income        
Net income (loss) $ 1,269 $ 669 $ 2,389 $ 1,386
Unrealized appreciation (decline) in value of available-for-sale investments:        
Unrealized holding gains (losses) arising during period (26) (173) (167) 72
Reclassification of net realized (gains) losses, included in net income (loss) 53 149 82 248
Foreign currency translation adjustments (16) 2 (49) 7
Comprehensive income (loss) 1,280 647 2,255 1,713
Net (income) loss attributable to noncontrolling interests 0 2 0 0
Comprehensive income (loss) available to Arch $ 1,280 $ 649 $ 2,255 $ 1,713