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Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fixed maturity securities:    
Total fixed maturity securities $ 45,069 $ 44,631
Equity securities:    
Equity securities 1,045 992
Short term and other 992 1,789
Total assets 47,106 47,412
Other liabilities 12 19
Total liabilities 12 19
Corporate and other bonds    
Fixed maturity securities:    
Total fixed maturity securities 25,218 25,234
States, municipalities and political subdivisions    
Fixed maturity securities:    
Total fixed maturity securities 11,979 11,592
Asset-backed    
Fixed maturity securities:    
Total fixed maturity securities 7,872 7,805
Common Stock    
Equity securities:    
Equity securities 228 195
Non-redeemable preferred stock    
Equity securities:    
Equity securities 817 797
Level 1    
Fixed maturity securities:    
Total fixed maturity securities 146 355
Equity securities:    
Equity securities 276 243
Short term and other 992 1,761
Total assets 1,414 2,359
Other liabilities 0 0
Total liabilities 0 0
Level 1 | Corporate and other bonds    
Fixed maturity securities:    
Total fixed maturity securities 146 355
Level 1 | States, municipalities and political subdivisions    
Fixed maturity securities:    
Total fixed maturity securities 0 0
Level 1 | Asset-backed    
Fixed maturity securities:    
Total fixed maturity securities 0 0
Level 1 | Common Stock    
Equity securities:    
Equity securities 209 175
Level 1 | Non-redeemable preferred stock    
Equity securities:    
Equity securities 67 68
Level 2    
Fixed maturity securities:    
Total fixed maturity securities 43,511 43,152
Equity securities:    
Equity securities 745 722
Short term and other 0 28
Total assets 44,256 43,902
Other liabilities 12 19
Total liabilities 12 19
Level 2 | Corporate and other bonds    
Fixed maturity securities:    
Total fixed maturity securities 24,195 24,109
Level 2 | States, municipalities and political subdivisions    
Fixed maturity securities:    
Total fixed maturity securities 11,922 11,546
Level 2 | Asset-backed    
Fixed maturity securities:    
Total fixed maturity securities 7,394 7,497
Level 2 | Common Stock    
Equity securities:    
Equity securities 0 0
Level 2 | Non-redeemable preferred stock    
Equity securities:    
Equity securities 745 722
Level 3    
Fixed maturity securities:    
Total fixed maturity securities 1,412 1,124
Equity securities:    
Equity securities 24 27
Short term and other 0 0
Total assets 1,436 1,151
Other liabilities 0 0
Total liabilities 0 0
Level 3 | Corporate and other bonds    
Fixed maturity securities:    
Total fixed maturity securities 877 770
Level 3 | States, municipalities and political subdivisions    
Fixed maturity securities:    
Total fixed maturity securities 57 46
Level 3 | Asset-backed    
Fixed maturity securities:    
Total fixed maturity securities 478 308
Level 3 | Common Stock    
Equity securities:    
Equity securities 19 20
Level 3 | Non-redeemable preferred stock    
Equity securities:    
Equity securities $ 5 $ 7