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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Segment Information
Segment information is summarized in the following table:
(Dollars in millions)Years ended December 31,
202120202019
Revenues:   
Commercial lines insurance   
Commercial casualty$1,270 $1,165 $1,102 
Commercial property1,043 1,010 958 
Commercial auto794 755 707 
Workers' compensation268 271 300 
Other commercial299 275 252 
Commercial lines insurance premiums3,674 3,476 3,319 
Fee revenues4 3 5 
Total commercial lines insurance3,678 3,479 3,324 
Personal lines insurance   
Personal auto609 615 621 
Homeowner726 658 607 
Other personal207 190 176 
Personal lines insurance premiums1,542 1,463 1,404 
Fee revenues4 4 4 
Total personal lines insurance1,546 1,467 1,408 
Excess and surplus lines insurance398 325 278 
Fee revenues2 2 2 
Total excess and surplus lines insurance400 327 280 
Life insurance premiums298 289 270 
Fee revenues5 2 4 
Total life insurance303 291 274 
Investments   
Investment income, net of expenses714 670 646 
Investment gains and losses, net2,409 865 1,650 
Total investment revenue3,123 1,535 2,296 
Other
Premiums570 427 333 
Other10 10 9 
Total other revenue580 437 342 
Total revenues$9,630 $7,536 $7,924 
Income (loss) before income taxes:   
Insurance underwriting results   
Commercial lines insurance$598 $64 $241 
Personal lines insurance97 47 8 
Excess and surplus lines insurance44 34 53 
Life insurance(16)11 1 
Investments3,018 1,433 2,197 
Other(71)(90)(28)
Total income before income taxes$3,670 $1,499 $2,472 
December 31,December 31,
Identifiable assets:20212020
Property casualty insurance$4,421 $3,838  
Life insurance1,590 1,661 
Investments24,481 21,332  
Other895 711  
Total$31,387 $27,542