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Investments - Analysis of Cost or Amortized Cost, Gross Unrealized Gains and Losses and Fair Value for Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale    
Investments, available-for-sale, amortized cost basis $ 17,996 $ 17,033
Investments, Available-for-Sale, Accumulated Gross Unrealized Gain Before Tax 212 78
Investments, Available-for-Sale, Accumulated Gross Unrealized Loss Before Tax 429 631
Investments, Available-for-Sale 17,779 16,480
Short-term investments, available-for-sale, amortized cost basis 149 298
Short-term investments, available-for-sale, accumulated gross unrealized gain, before tax 0 0
Short-term investments, available-for-sale, accumulated gross unrealized loss, before tax 0 0
Short-Term Investments 149 298
Total 17,847 16,735
Gross unrealized gain 212 78
Gross unrealized loss 429 631
Fixed maturities, at fair value 17,630 16,182
Corporate    
Debt Securities, Available-for-sale    
Total 9,385 8,652
Gross unrealized gain 171 61
Gross unrealized loss 193 333
Fixed maturities, at fair value 9,363 8,380
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale    
Total 5,043 4,976
Gross unrealized gain 24 15
Gross unrealized loss 221 270
Fixed maturities, at fair value 4,846 4,721
Government-sponsored enterprises    
Debt Securities, Available-for-sale    
Total 2,348 2,282
Gross unrealized gain 3 1
Gross unrealized loss 5 9
Fixed maturities, at fair value 2,346 2,274
Asset-backed    
Debt Securities, Available-for-sale    
Total 776 567
Gross unrealized gain 11 1
Gross unrealized loss 9 17
Fixed maturities, at fair value 778 551
United States government    
Debt Securities, Available-for-sale    
Total 272 228
Gross unrealized gain 3 0
Gross unrealized loss 1 2
Fixed maturities, at fair value 274 226
Foreign government    
Debt Securities, Available-for-sale    
Total 23 30
Gross unrealized gain 0 0
Gross unrealized loss 0 0
Fixed maturities, at fair value $ 23 $ 30