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Unaudited Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues    
Net premiums earned $ 4,188 $ 3,422
Net investment income 378 327
Net realized gains (losses) 3 67
Other underwriting income 53 12
Equity in net income of investments accounted for using the equity method 53 99
Other income (loss) (2) 14
Total revenues 4,673 3,941
Expenses    
Losses and loss adjustment expenses 2,587 1,728
Acquisition expenses 764 607
Other operating expenses 473 363
Corporate expenses 60 53
Amortization of intangible assets 49 21
Interest expense 35 34
Net foreign exchange (gains) losses 27 (31)
Total expenses 3,995 2,775
Income (loss) before income taxes and income (loss) from operating affiliates 678 1,166
Income tax (expense) benefit (121) (101)
Income (loss) from operating affiliates 17 55
Net income (loss) available to Arch 574 1,120
Preferred dividends (10) (10)
Net income (loss) available to Arch common shareholders $ 564 $ 1,110
Net income per common share and common share equivalent    
Basic (per share) $ 1.51 $ 2.99
Diluted (per share) $ 1.48 $ 2.92
Weighted average common shares and common share equivalents outstanding    
Basic (shares) 372.9 370.9
Diluted (shares) 381.9 380.5