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v3.25.0.1

Investments - Amortized Cost or Cost and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | $ 66,195 | $ 68,119 |  |
Allowance for credit losses |  | (38) | (34) | $ (37) | $ (21)
Gross Unrealized Gains |  | 962 | 1,073 |  |
Gross Unrealized Losses |  | (3,113) | (3,916) |  |
Bonds available for sale | [1] | 64,006 | 65,242 |  |
Non-Investment Grade |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Bonds available for sale |  | $ 3,600 | $ 5,200 |  |
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Concentration risk (as a percent) |  | 6.00% | 8.00% |  |
U.S. government and government sponsored entities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | $ 3,346 | $ 4,444 |  |
Allowance for credit losses |  | 0 | 0 |  |
Gross Unrealized Gains |  | 20 | 40 |  |
Gross Unrealized Losses |  | (99) | (89) |  |
Bonds available for sale |  | 3,267 | 4,395 |  |
Obligations of states, municipalities and political subdivisions |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | 3,223 | 4,930 |  |
Allowance for credit losses |  | 0 | 0 |  |
Gross Unrealized Gains |  | 32 | 60 |  |
Gross Unrealized Losses |  | (112) | (157) |  |
Bonds available for sale |  | 3,143 | 4,833 |  |
Non-U.S. governments |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | 8,644 | 8,973 |  |
Allowance for credit losses |  | (1) | (1) |  |
Gross Unrealized Gains |  | 54 | 94 |  |
Gross Unrealized Losses |  | (590) | (670) |  |
Bonds available for sale |  | 8,107 | 8,396 |  |
Corporate debt |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | 33,031 | 34,013 |  |
Allowance for credit losses |  | (28) | (20) |  |
Gross Unrealized Gains |  | 581 | 606 |  |
Gross Unrealized Losses |  | (1,758) | (2,253) |  |
Bonds available for sale |  | 31,826 | 32,346 |  |
Mortgage-backed, asset-backed and collateralized |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | 17,951 | 15,759 |  |
Allowance for credit losses |  | (9) | (13) |  |
Gross Unrealized Gains |  | 275 | 273 |  |
Gross Unrealized Losses |  | (554) | (747) |  |
Bonds available for sale |  | 17,663 | 15,272 |  |
RMBS |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | 8,820 | 6,423 |  |
Allowance for credit losses |  | (6) | (9) |  |
Gross Unrealized Gains |  | 209 | 219 |  |
Gross Unrealized Losses |  | (419) | (426) |  |
Bonds available for sale |  | 8,604 | 6,207 |  |
CMBS |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | 3,988 | 4,326 |  |
Allowance for credit losses |  | (3) | (4) |  |
Gross Unrealized Gains |  | 32 | 23 |  |
Gross Unrealized Losses |  | (91) | (198) |  |
Bonds available for sale |  | 3,926 | 4,147 |  |
CLO/ABS |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost |  | 5,143 | 5,010 |  |
Allowance for credit losses |  | 0 | 0 |  |
Gross Unrealized Gains |  | 34 | 31 |  |
Gross Unrealized Losses |  | (44) | (123) |  |
Bonds available for sale |  | $ 5,133 | $ 4,918 |  |
[1] | See Note 10 for details of balances associated with variable interest entities.

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