v3.25.3
Investments - Gross Unrealized Appreciation (Depreciation) on Debt Securities by Type of Issuer, Including Disposal Groups (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Amortized cost, including held for sale assets $ 10,125
Allowance for Credit Loss, including held for sale assets (111)
Unrealized Appreciation, including held for sale assets 123
Unrealized Depreciation, including held for sale assets (714)
Fair Value, including held for sale assets 9,423
Federal government and agency  
Debt Securities, Available-for-sale [Line Items]  
Amortized cost, including held for sale assets 276
Allowance for Credit Loss, including held for sale assets 0
Unrealized Appreciation, including held for sale assets 14
Unrealized Depreciation, including held for sale assets (9)
Fair Value, including held for sale assets 281
State and local government  
Debt Securities, Available-for-sale [Line Items]  
Amortized cost, including held for sale assets 37
Allowance for Credit Loss, including held for sale assets 0
Unrealized Appreciation, including held for sale assets 1
Unrealized Depreciation, including held for sale assets (1)
Fair Value, including held for sale assets 37
Foreign government  
Debt Securities, Available-for-sale [Line Items]  
Amortized cost, including held for sale assets 350
Allowance for Credit Loss, including held for sale assets 0
Unrealized Appreciation, including held for sale assets 5
Unrealized Depreciation, including held for sale assets (11)
Fair Value, including held for sale assets 344
Corporate  
Debt Securities, Available-for-sale [Line Items]  
Amortized cost, including held for sale assets 9,091
Allowance for Credit Loss, including held for sale assets (111)
Unrealized Appreciation, including held for sale assets 102
Unrealized Depreciation, including held for sale assets (659)
Fair Value, including held for sale assets 8,423
Mortgage and other asset-backed  
Debt Securities, Available-for-sale [Line Items]  
Amortized cost, including held for sale assets 371
Allowance for Credit Loss, including held for sale assets 0
Unrealized Appreciation, including held for sale assets 1
Unrealized Depreciation, including held for sale assets (34)
Fair Value, including held for sale assets $ 338