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Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Estimated Fair Value    
Total, Estimated Fair Value $ 20,691 $ 27,288
Gross Unrealized Losses    
Total, Gross Unrealized Losses 2,295 3,039
Fixed maturity securities    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 4,305 8,969
12 Months or Longer, Estimated Fair Value 16,386 18,319
Total, Estimated Fair Value 20,691 27,288
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 109 266
12 Months or Longer, Gross Unrealized Losses 2,186 2,773
Total, Gross Unrealized Losses 2,295 3,039
Corporate bonds and other    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 2,802 5,846
12 Months or Longer, Estimated Fair Value 8,578 10,388
Total, Estimated Fair Value 11,380 16,234
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 58 165
12 Months or Longer, Gross Unrealized Losses 786 1,140
Total, Gross Unrealized Losses 844 1,305
States, municipalities and political subdivisions    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 701 1,247
12 Months or Longer, Estimated Fair Value 3,162 2,967
Total, Estimated Fair Value 3,863 4,214
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 33 52
12 Months or Longer, Gross Unrealized Losses 732 783
Total, Gross Unrealized Losses 765 835
Total asset-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 665 1,709
12 Months or Longer, Estimated Fair Value 4,322 4,555
Total, Estimated Fair Value 4,987 6,264
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 14 45
12 Months or Longer, Gross Unrealized Losses 646 823
Total, Gross Unrealized Losses 660 868
Residential mortgage-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 133 849
12 Months or Longer, Estimated Fair Value 2,038 2,010
Total, Estimated Fair Value 2,171 2,859
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 2 22
12 Months or Longer, Gross Unrealized Losses 380 466
Total, Gross Unrealized Losses 382 488
Commercial mortgage-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 27 180
12 Months or Longer, Estimated Fair Value 923 988
Total, Estimated Fair Value 950 1,168
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 2
12 Months or Longer, Gross Unrealized Losses 88 139
Total, Gross Unrealized Losses 88 141
Other asset-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 505 680
12 Months or Longer, Estimated Fair Value 1,361 1,557
Total, Estimated Fair Value 1,866 2,237
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 12 21
12 Months or Longer, Gross Unrealized Losses 178 218
Total, Gross Unrealized Losses 190 239
U.S. Treasury and obligations of government-sponsored enterprises    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 29 49
12 Months or Longer, Estimated Fair Value 23 41
Total, Estimated Fair Value 52 90
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 2 1
12 Months or Longer, Gross Unrealized Losses 1
Total, Gross Unrealized Losses 3 1
Foreign government    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 108 118
12 Months or Longer, Estimated Fair Value 301 368
Total, Estimated Fair Value 409 486
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 2 3
12 Months or Longer, Gross Unrealized Losses 21 27
Total, Gross Unrealized Losses $ 23 $ 30