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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
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale    
Investments, available-for-sale, amortized cost basis $ 17,109 $ 17,033
Investments, Available-for-Sale, Accumulated Gross Unrealized Gain Before Tax 96 78
Investments, Available-for-Sale, Accumulated Gross Unrealized Loss Before Tax 582 631
Investments, Available-for-Sale 16,623 16,480
Short-term investments, available-for-sale, amortized cost basis 100 298
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 100 298
Total 17,009 16,735
Gross unrealized gain 96 78
Gross unrealized loss 582 631
Fixed maturities, at fair value 16,523 16,182
Corporate    
Debt Securities, Available-for-sale    
Total 8,833 8,652
Gross unrealized gain 78 61
Gross unrealized loss 278 333
Fixed maturities, at fair value 8,633 8,380
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale    
Total 4,973 4,976
Gross unrealized gain 10 15
Gross unrealized loss 291 270
Fixed maturities, at fair value 4,692 4,721
Government-sponsored enterprises    
Debt Securities, Available-for-sale    
Total 2,310 2,282
Gross unrealized gain 3 1
Gross unrealized loss 3 9
Fixed maturities, at fair value 2,310 2,274
Asset-backed    
Debt Securities, Available-for-sale    
Total 649 567
Gross unrealized gain 5 1
Gross unrealized loss 9 17
Fixed maturities, at fair value 645 551
United States government    
Debt Securities, Available-for-sale    
Total 217 228
Gross unrealized gain 0 0
Gross unrealized loss 1 2
Fixed maturities, at fair value 216 226
Foreign government    
Debt Securities, Available-for-sale    
Total 27 30
Gross unrealized gain 0 0
Gross unrealized loss 0 0
Fixed maturities, at fair value $ 27 $ 30