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Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Estimated Fair Value    
Total, Estimated Fair Value $ 22,400 $ 25,731
Gross Unrealized Losses    
Total, Gross Unrealized Losses 2,236 2,995
Fixed maturity securities    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 2,623 3,483
12 Months or Longer, Estimated Fair Value 19,777 22,248
Total, Estimated Fair Value 22,400 25,731
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 47 74
12 Months or Longer, Gross Unrealized Losses 2,189 2,921
Total, Gross Unrealized Losses 2,236 2,995
Corporate bonds and other    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 1,664 1,943
12 Months or Longer, Estimated Fair Value 11,240 13,406
Total, Estimated Fair Value 12,904 15,349
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 31 37
12 Months or Longer, Gross Unrealized Losses 869 1,308
Total, Gross Unrealized Losses 900 1,345
States, municipalities and political subdivisions    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 422 598
12 Months or Longer, Estimated Fair Value 3,155 3,104
Total, Estimated Fair Value 3,577 3,702
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 7 18
12 Months or Longer, Gross Unrealized Losses 610 685
Total, Gross Unrealized Losses 617 703
Residential mortgage-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 130 233
12 Months or Longer, Estimated Fair Value 2,162 2,212
Total, Estimated Fair Value 2,292 2,445
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 2 4
12 Months or Longer, Gross Unrealized Losses 360 421
Total, Gross Unrealized Losses 362 425
Commercial mortgage-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 112 200
12 Months or Longer, Estimated Fair Value 1,134 1,184
Total, Estimated Fair Value 1,246 1,384
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 5
12 Months or Longer, Gross Unrealized Losses 141 225
Total, Gross Unrealized Losses 141 230
Other asset-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 151 392
12 Months or Longer, Estimated Fair Value 1,638 1,869
Total, Estimated Fair Value 1,789 2,261
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 4 8
12 Months or Longer, Gross Unrealized Losses 182 248
Total, Gross Unrealized Losses 186 256
Total asset-backed    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 393 825
12 Months or Longer, Estimated Fair Value 4,934 5,265
Total, Estimated Fair Value 5,327 6,090
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 6 17
12 Months or Longer, Gross Unrealized Losses 683 894
Total, Gross Unrealized Losses 689 911
U.S. Treasury and obligations of government-sponsored enterprises    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 45 65
12 Months or Longer, Estimated Fair Value 45 23
Total, Estimated Fair Value 90 88
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 2 1
12 Months or Longer, Gross Unrealized Losses 2 1
Total, Gross Unrealized Losses 4 2
Foreign government    
Estimated Fair Value    
Less than 12 Months, Estimated Fair Value 99 52
12 Months or Longer, Estimated Fair Value 403 450
Total, Estimated Fair Value 502 502
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Losses 1 1
12 Months or Longer, Gross Unrealized Losses 25 33
Total, Gross Unrealized Losses $ 26 $ 34