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Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	Year Ended December 31, 2022 (Dollars in millions) Reinsurance Insurance Total Gross written premiums $ 9,316 $ 4,636 $ 13,952 Net written premiums 8,983 3,361 12,344 Premiums earned $ 8,663 $ 3,124 $ 11,787 Incurred losses and LAE 5,997 2,103 8,100 Commission and brokerage 2,134 394 2,528 Other underwriting expenses 218 463 682 Underwriting gain (loss) $ 313 $ 164 $ 477 Net investment income 830 Net realized capital gains (losses) (455) Corporate expenses (61) Interest, fee and bond issue cost amortization expense (101) Other income (expense) (102) Income (loss) before taxes $ 588 Year Ended December 31, 2021 (Dollars in millions) Reinsurance Insurance Total Gross written premiums $ 9,067 $ 3,982 $ 13,050 Net written premiums 8,536 2,910 11,446 Premiums earned $ 7,757 $ 2,649 $ 10,406 Incurred losses and LAE 5,556 1,835 7,391 Commission and brokerage 1,854 354 2,209 Other underwriting expenses 199 383 583 Underwriting gain (loss) $ 147 $ 76 $ 224 Net investment income 1,165 Net realized capital gains (losses) 258 Corporate expenses (68) Interest, fee and bond issue cost amortization expense (70) Other income (expense) 37 Income (loss) before taxes $ 1,546 Year Ended December 31, 2020 (Dollars in millions) Reinsurance Insurance Total Gross written premiums $ 7,282 $ 3,201 $ 10,482 Net written premiums 6,768 2,349 9,117 Premiums earned $ 6,466 $ 2,215 $ 8,682 Incurred losses and LAE 4,933 1,617 6,551 Commission and brokerage 1,552 321 1,873 Other underwriting expenses 176 336 511 Underwriting gain (loss) $ (195) $ (58) $ (254) Net investment income 642 Net realized capital gains (losses) 268 Corporate expenses (41) Interest, fee and bond issue cost amortization expense (36) Other income (expense) 6 Income (loss) before taxes $ 585
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Year Ended December 31, (Dollars in millions) 2022 2021 2020 United Kingdom gross written premium $ 1,217 $ 1,246 $ 1,116

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- Definition

Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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