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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Gross written premium | $ 13,952 | $ 13,050 | $ 10,482
Net written premiums | 12,344 | 11,446 | 9,117
Premiums earned | 11,787 | 10,406 | 8,682
Incurred losses and LAE | 8,100 | 7,391 | 6,551
Commission and brokerage | 2,528 | 2,209 | 1,873
Other underwriting expenses | 682 | 583 | 511
Underwriting gain (loss) | 477 | 224 | (254)
Net investment income | 830 | 1,165 | 642
Net realized gains (losses) | 38 | 50 | (11)
Corporate expenses | (61) | (68) | (41)
Interest, fee and bond issue cost amortization expense | (101) | (70) | (36)
Other income (expense) | (102) | 37 | 6
INCOME (LOSS) BEFORE TAXES | 588 | 1,546 | 585
Reinsurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premium | 9,316 | 9,067 | 7,282
Net written premiums | 8,983 | 8,536 | 6,768
Premiums earned | 8,663 | 7,757 | 6,466
Incurred losses and LAE | 5,997 | 5,556 | 4,933
Commission and brokerage | 2,134 | 1,854 | 1,552
Other underwriting expenses | 218 | 199 | 176
Underwriting gain (loss) | 313 | 147 | (195)
Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premium | 4,636 | 3,982 | 3,201
Net written premiums | 3,361 | 2,910 | 2,349
Premiums earned | 3,124 | 2,649 | 2,215
Incurred losses and LAE | 2,103 | 1,835 | 1,617
Commission and brokerage | 394 | 354 | 321
Other underwriting expenses | 463 | 383 | 336
Underwriting gain (loss) | $ 164 | $ 76 | $ (58)

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