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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Comprehensive Income      
Net income $ 4,399 $ 4,312 $ 4,442
Unrealized appreciation (decline) in value of available-for-sale investments:      
Unrealized holding gains (losses) arising during year 661 (23) 547
Reclassification of net realized (gains) losses, included in net income (20) 81 400
Foreign currency translation adjustments 84 (102) 23
Comprehensive income (loss) 5,124 4,268 5,412
Net (income) loss attributable to noncontrolling interests 0 0 1
Comprehensive income available to Arch (loss) $ 5,124 $ 4,268 $ 5,413