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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Millions
Dec. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Fixed maturities, amortized cost $ 16,735 $ 14,361
Equity securities, cost 3,953 4,282
Short-term investments, amortized cost 298 0
Land, building and equipment, accumulated depreciation $ 347 $ 337
Common stock, par value $ 2 $ 2
Common stock, shares authorized 500,000 500,000
Common stock, shares, issued 198,300 198,300
Treasury Stock, Shares 41,900 41,300