v3.25.2
Investments - Unrealized Capital Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value $ 2,198 $ 2,350
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 77 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10,961 11,475
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,742 2,067
Debt Securities, Available-for-sale, Unrealized Loss Position 13,159 13,825
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1,819 2,153
Minimum    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Fixed Maturities Average Duration 6 years  
Maximum    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Fixed Maturities Average Duration 6 years 6 months  
U.S. Treasuries    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value $ 281 229
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 14 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 131 127
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 31 34
Debt Securities, Available-for-sale, Unrealized Loss Position 412 356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 45 50
State, municipalities and political subdivisions    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 2 4
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 356 403
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 75 82
Debt Securities, Available-for-sale, Unrealized Loss Position 358 407
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 75 82
U.S. corporate public securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 683 615
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 45 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,571 3,626
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 792 868
Debt Securities, Available-for-sale, Unrealized Loss Position 4,254 4,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 837 896
U.S. corporate private securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 284 405
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 3 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,140 2,260
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 189 254
Debt Securities, Available-for-sale, Unrealized Loss Position 2,424 2,665
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 192 264
Foreign corporate public securities and foreign governments    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 348 355
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 10 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,007 1,051
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 196 221
Debt Securities, Available-for-sale, Unrealized Loss Position 1,355 1,406
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 206 235
Foreign corporate private securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 246 429
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 2 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,089 1,205
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 54 127
Debt Securities, Available-for-sale, Unrealized Loss Position 1,335 1,634
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 56 138
Residential mortgage-backed    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 170 253
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 2 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 701 704
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 101 122
Debt Securities, Available-for-sale, Unrealized Loss Position 871 957
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 103 128
Commercial mortgage-backed    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 74 18
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,769 1,888
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 283 333
Debt Securities, Available-for-sale, Unrealized Loss Position 1,843 1,906
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 283 333
Other asset-backed securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 110 29
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 1 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 182 197
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 20 24
Debt Securities, Available-for-sale, Unrealized Loss Position 292 226
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 21 25
US Government Corporations and Agencies Securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 0  
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 15  
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1  
Debt Securities, Available-for-sale, Unrealized Loss Position 15  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1  
US Treasury and Government    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value   13
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   14
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   2
Debt Securities, Available-for-sale, Unrealized Loss Position   27
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss   $ 2