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Business Segments (Revenues by Line of Business) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total revenues $ 3,519 $ 3,304 $ 6,963 $ 6,456
Total operating revenues 3,529 3,336 6,995 6,523
Net investment gains (losses) (10) (32) (32) (67)
Operating Segments | Specialty        
Total revenues 1,388 1,361 2,760 2,694
Operating Segments | Commercial        
Total revenues 1,432 1,291 2,818 2,493
Operating Segments | International        
Total revenues 343 328 689 641
Operating Segments | Life & Group        
Total revenues 348 342 689 671
Operating Segments | Corporate & Other        
Total revenues 21 16 45 29
Eliminations        
Total revenues (3) (2) (6) (5)
Management & Professional Liability | Operating Segments | Specialty        
Total revenues 733 718 1,462 1,423
Surety | Operating Segments | Specialty        
Total revenues 196 183 378 351
Warranty & Alternative Risks | Operating Segments | Specialty        
Total revenues 459 460 920 920
Middle Market | Operating Segments | Commercial        
Total revenues 427 419 859 817
Construction | Operating Segments | Commercial        
Total revenues 483 420 938 805
Small Business | Operating Segments | Commercial        
Total revenues 157 160 311 310
Other Commercial | Operating Segments | Commercial        
Total revenues 365 292 710 561
Canada | Operating Segments | International        
Total revenues 99 96 197 189
Europe | Operating Segments | International        
Total revenues 147 135 290 262
Hardy | Operating Segments | International        
Total revenues $ 97 $ 97 $ 202 $ 190