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Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fixed maturity securities:    
Fixed maturity securities $ 41,111 $ 40,425
Equity securities:    
Equity securities 659 683
Short-term and other 1,922 2,008
Total assets 43,692 43,116
Other liabilities 0 1
Total liabilities 0 1
Corporate and other bonds    
Fixed maturity securities:    
Fixed maturity securities 25,841 25,132
States, municipalities and political subdivisions    
Fixed maturity securities:    
Fixed maturity securities 6,804 7,392
Asset-backed    
Fixed maturity securities:    
Fixed maturity securities 8,466 7,901
Common Stock    
Equity securities:    
Equity securities 180 191
Non-redeemable preferred stock    
Equity securities:    
Equity securities 479 492
Level 1    
Fixed maturity securities:    
Fixed maturity securities 223 161
Equity securities:    
Equity securities 198 219
Short-term and other 1,852 1,976
Total assets 2,273 2,356
Other liabilities 0 0
Total liabilities 0 0
Level 1 | Corporate and other bonds    
Fixed maturity securities:    
Fixed maturity securities 223 161
Level 1 | States, municipalities and political subdivisions    
Fixed maturity securities:    
Fixed maturity securities 0 0
Level 1 | Asset-backed    
Fixed maturity securities:    
Fixed maturity securities 0 0
Level 1 | Common Stock    
Equity securities:    
Equity securities 162 167
Level 1 | Non-redeemable preferred stock    
Equity securities:    
Equity securities 36 52
Level 2    
Fixed maturity securities:    
Fixed maturity securities 38,692 38,274
Equity securities:    
Equity securities 441 440
Short-term and other 70 32
Total assets 39,203 38,746
Other liabilities 0 1
Total liabilities 0 1
Level 2 | Corporate and other bonds    
Fixed maturity securities:    
Fixed maturity securities 24,340 23,926
Level 2 | States, municipalities and political subdivisions    
Fixed maturity securities:    
Fixed maturity securities 6,762 7,348
Level 2 | Asset-backed    
Fixed maturity securities:    
Fixed maturity securities 7,590 7,000
Level 2 | Common Stock    
Equity securities:    
Equity securities 0 0
Level 2 | Non-redeemable preferred stock    
Equity securities:    
Equity securities 441 440
Level 3    
Fixed maturity securities:    
Fixed maturity securities 2,196 1,990
Equity securities:    
Equity securities 20 24
Short-term and other 0 0
Total assets 2,216 2,014
Other liabilities 0 0
Total liabilities 0 0
Level 3 | Corporate and other bonds    
Fixed maturity securities:    
Fixed maturity securities 1,278 1,045
Level 3 | States, municipalities and political subdivisions    
Fixed maturity securities:    
Fixed maturity securities 42 44
Level 3 | Asset-backed    
Fixed maturity securities:    
Fixed maturity securities 876 901
Level 3 | Common Stock    
Equity securities:    
Equity securities 18 24
Level 3 | Non-redeemable preferred stock    
Equity securities:    
Equity securities $ 2 $ 0