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Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
REVENUES:      
Premiums earned $ 11,787 $ 10,406 $ 8,682
Net investment income 830 1,165 642
Net gains (losses) on investments:      
Credit allowances on fixed maturity securities (33) (28) (2)
Gains (losses) from fair value adjustments (460) 236 280
Net realized gains (losses) from dispositions 38 50 (11)
Total net realized gains (losses) on investments (455) 258 268
Other income (expense) (102) 37 6
Total revenues 12,060 11,866 9,598
CLAIMS AND EXPENSES:      
Incurred losses and loss adjustment expenses 8,100 7,391 6,551
Commission, brokerage, taxes and fees 2,528 2,209 1,873
Other underwriting expenses 682 583 511
Corporate expenses 61 68 41
Interest, fees and bond issue cost amortization expense 101 70 36
Total claims and expenses 11,472 10,321 9,013
INCOME (LOSS) BEFORE TAXES 588 1,546 585
Income tax expense (benefit) (9) 167 71
NET INCOME (LOSS) 597 1,379 514
Other comprehensive income (loss), net of tax:      
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period (2,037) (488) 423
Reclassification adjustment for realized losses (gains) included in net income (loss) 89 4 (3)
Total URA(D) on securities arising during the period (1,948) (485) 420
Foreign currency translation adjustments (77) (62) 86
Benefit plan actuarial net gain (loss) for the period 15 17 (6)
Reclassification adjustment for amortization of net (gain) loss included in net income (loss) 2 6 6
Total benefit plan net gain (loss) for the period 17 23 1
Total other comprehensive income (loss), net of tax (2,008) (523) 507
COMPREHENSIVE INCOME (LOSS) $ (1,411) $ 856 $ 1,021
EARNINGS PER COMMON SHARE:      
Basic $ 15.19 $ 34.66 $ 12.81
Diluted $ 15.19 $ 34.62 $ 12.78