v3.26.3
Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Total, Estimated Fair Value $ 34,419 $ 20,644
Total, Gross Unrealized Losses 4,169 2,286
Total fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 20,470 3,998
Less than 12 Months, Gross Unrealized Losses 1,030 79
12 Months or Longer, Estimated Fair Value 13,949 16,646
12 Months or Longer, Gross Unrealized Losses 3,139 2,207
Total, Estimated Fair Value 34,419 20,644
Total, Gross Unrealized Losses 4,169 2,286
Corporate bonds and other    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 12,474 2,776
Less than 12 Months, Gross Unrealized Losses 629 56
12 Months or Longer, Estimated Fair Value 6,978 8,576
12 Months or Longer, Gross Unrealized Losses 1,236 825
Total, Estimated Fair Value 19,452 11,352
Total, Gross Unrealized Losses 1,865 881
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 3,560 403
Less than 12 Months, Gross Unrealized Losses 205 8
12 Months or Longer, Estimated Fair Value 3,074 3,471
12 Months or Longer, Gross Unrealized Losses 1,042 734
Total, Estimated Fair Value 6,634 3,874
Total, Gross Unrealized Losses 1,247 742
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 2,115 154
Less than 12 Months, Gross Unrealized Losses 124 1
12 Months or Longer, Estimated Fair Value 1,683 2,002
12 Months or Longer, Gross Unrealized Losses 488 365
Total, Estimated Fair Value 3,798 2,156
Total, Gross Unrealized Losses 612 366
Commercial mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 493 36
Less than 12 Months, Gross Unrealized Losses 15 2
12 Months or Longer, Estimated Fair Value 748 887
12 Months or Longer, Gross Unrealized Losses 90 78
Total, Estimated Fair Value 1,241 923
Total, Gross Unrealized Losses 105 80
Other asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 1,167 420
Less than 12 Months, Gross Unrealized Losses 39 9
12 Months or Longer, Estimated Fair Value 1,250 1,432
12 Months or Longer, Gross Unrealized Losses 260 185
Total, Estimated Fair Value 2,417 1,852
Total, Gross Unrealized Losses 299 194
Total asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 3,775 610
Less than 12 Months, Gross Unrealized Losses 178 12
12 Months or Longer, Estimated Fair Value 3,681 4,321
12 Months or Longer, Gross Unrealized Losses 838 628
Total, Estimated Fair Value 7,456 4,931
Total, Gross Unrealized Losses 1,016 640
U.S. Treasury and obligations of government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 261 78
Less than 12 Months, Gross Unrealized Losses 4 2
12 Months or Longer, Estimated Fair Value 11 18
12 Months or Longer, Gross Unrealized Losses 1 1
Total, Estimated Fair Value 272 96
Total, Gross Unrealized Losses 5 3
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Estimated Fair Value 400 131
Less than 12 Months, Gross Unrealized Losses 14 1
12 Months or Longer, Estimated Fair Value 205 260
12 Months or Longer, Gross Unrealized Losses 22 19
Total, Estimated Fair Value 605 391
Total, Gross Unrealized Losses $ 36 $ 20