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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
REVENUES:    
Premiums earned $ 3,852 $ 3,652
Net investment income 491 457
Net gains (losses) on investments (7) (7)
Other income (expense) (73) 31
Total revenues 4,263 4,133
CLAIMS AND EXPENSES:    
Incurred losses and loss adjustment expenses 2,893 2,237
Commission, brokerage, taxes and fees 824 782
Other underwriting expenses 238 224
Corporate expenses 21 22
Interest, fees and bond issue cost amortization expense 38 37
Total claims and expenses 4,015 3,302
INCOME (LOSS) BEFORE TAXES 248 832
Income tax expense (benefit) 39 99
NET INCOME (LOSS) 210 733
Other comprehensive income (loss), net of tax:    
Unrealized appreciation (depreciation) ("URA(D)") of securities arising during the period 284 (158)
Reclassification adjustment for realized losses (gains) included in net income (loss) 4 5
Total URA(D) of securities arising during the period 289 (153)
Foreign currency translation and other adjustments 64 (38)
Reclassification adjustment for amortization of net (gain) loss included in net income (loss) 0 0
Total benefit plan net gain (loss) for the period 0 0
Total other comprehensive income (loss), net of tax 352 (191)
COMPREHENSIVE INCOME (LOSS) $ 562 $ 542
EARNINGS PER COMMON SHARE:    
Basic (in dollars per share) $ 4.90 $ 16.87
Diluted (in dollars per share) $ 4.90 $ 16.87