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Segment Information (Net Premiums Earned By Geographic Region) (Details) - Geographic Concentration Risk - Revenue Benchmark
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
North America [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 69.00% 70.00% 70.00%
Europe [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage [1] 11.00% 12.00% 11.00%
Asia Pacific and Far East [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 14.00% 12.00% 12.00%
Latin America [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 6.00% 6.00% 7.00%
[1] (1)     Europe includes Middle East and Africa regions.