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Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 (Dollars in millions) Reinsurance Insurance Total Reinsurance Insurance Total Gross written premiums $ 2,551 $ 1,129 $ 3,680 $ 6,938 $ 3,376 $ 10,313 Net written premiums 2,460 862 3,323 6,664 2,492 9,156 Premiums earned $ 2,245 $ 822 $ 3,067 $ 6,451 $ 2,324 $ 8,775 Incurred losses and LAE 1,992 631 2,623 4,699 1,591 6,289 Commission and brokerage 537 104 641 1,582 295 1,877 Other underwriting expenses 54 115 169 156 344 500 Underwriting gain (loss) $ (338) $ (29) $ (367) $ 14 $ 95 $ 109 Net investment income 151 620 Net gains (losses) on investments (129) (519) Corporate expenses (16) (45) Interest, fee and bond issue cost amortization expense (25) (74) Other income (expense) (16) (71) Income (loss) before taxes $ (401) $ 20 (Some amounts may not reconcile due to rounding.) Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 (Dollars in millions) Reinsurance Insurance Total Reinsurance Insurance Total Gross written premiums $ 2,488 $ 1,009 $ 3,498 $ 6,696 $ 2,924 $ 9,619 Net written premiums 2,293 733 3,026 6,266 2,123 8,389 Premiums earned $ 1,976 $ 680 $ 2,656 $ 5,675 $ 1,928 $ 7,603 Incurred losses and LAE 1,766 508 2,274 4,206 1,366 5,572 Commission and brokerage 471 93 564 1,353 258 1,611 Other underwriting expenses 45 96 141 144 280 424 Underwriting gain (loss) $ (306) $ (17) $ (323) $ (29) $ 24 $ (5) Net investment income 293 960 Net gains (losses) on investments (4) 139 Corporate expenses (18) (46) Interest, fee and bond issue cost amortization expense (16) (47) Other income (expense) (20) 44 Income (loss) before taxes $ (88) $ 1,046 (Some amounts may not reconcile due to rounding.)
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2022 2021 2022 2021 United Kingdom gross written premium $ 312 $ 282 $ 936 $ 897

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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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