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Unaudited Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Comprehensive Income        
Net income (loss) $ 669 $ 404 $ 1,386 $ 602
Unrealized appreciation (decline) in value of available-for-sale investments:        
Unrealized holding gains (losses) arising during period (173) (598) 72 (1,282)
Reclassification of net realized (gains) losses, included in net income (loss) 149 58 248 160
Foreign currency translation adjustments 2 (68) 7 (71)
Comprehensive income (loss) 647 (204) 1,713 (591)
Net (income) loss attributable to noncontrolling interests 2 0 0 (2)
Comprehensive income (loss) available to Arch $ 649 $ (204) $ 1,713 $ (593)