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Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
United Kingdom [Member]        
Segment Reporting Information [Line Items]        
Gross written premium $ 312 $ 282 $ 936 $ 897