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v3.25.2

Investments - Amortized Cost or Cost and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 70,229 | $ 66,195 |  |  |  |
Allowance for Credit Losses | (45) | (38) | $ (30) | $ (33) | $ (28) | $ (34)
Gross Unrealized Gains | 1,016 | 962 |  |  |  |
Gross Unrealized Losses | (2,340) | (3,113) |  |  |  |
Bonds available for sale | 68,860 | 64,006 |  |  |  |
Non-Investment Grade |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Bonds available for sale | $ 5,700 | $ 3,600 |  |  |  |
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Concentration risk (as a percent) | 8.00% | 6.00% |  |  |  |
U.S. government and government sponsored entities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 2,964 | $ 3,346 |  |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |  |
Gross Unrealized Gains | 33 | 20 |  |  |  |
Gross Unrealized Losses | (88) | (99) |  |  |  |
Bonds available for sale | 2,909 | 3,267 |  |  |  |
Obligations of states, municipalities and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 3,047 | 3,223 |  |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |  |
Gross Unrealized Gains | 52 | 32 |  |  |  |
Gross Unrealized Losses | (76) | (112) |  |  |  |
Bonds available for sale | 3,023 | 3,143 |  |  |  |
Non-U.S. governments |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 7,250 | 8,644 |  |  |  |
Allowance for Credit Losses | (1) | (1) |  |  |  |
Gross Unrealized Gains | 88 | 54 |  |  |  |
Gross Unrealized Losses | (424) | (590) |  |  |  |
Bonds available for sale | 6,913 | 8,107 |  |  |  |
Corporate debt |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 37,369 | 33,031 |  |  |  |
Allowance for Credit Losses | (34) | (28) |  |  |  |
Gross Unrealized Gains | 499 | 581 |  |  |  |
Gross Unrealized Losses | (1,349) | (1,758) |  |  |  |
Bonds available for sale | 36,485 | 31,826 |  |  |  |
Mortgage-backed, asset-backed and collateralized |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 19,599 | 17,951 |  |  |  |
Allowance for Credit Losses | (10) | (9) |  |  |  |
Gross Unrealized Gains | 344 | 275 |  |  |  |
Gross Unrealized Losses | (403) | (554) |  |  |  |
Bonds available for sale | 19,530 | 17,663 |  |  |  |
RMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 9,806 | 8,820 |  |  |  |
Allowance for Credit Losses | (5) | (6) |  |  |  |
Gross Unrealized Gains | 245 | 209 |  |  |  |
Gross Unrealized Losses | (329) | (419) |  |  |  |
Bonds available for sale | 9,717 | 8,604 |  |  |  |
CMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 3,741 | 3,988 |  |  |  |
Allowance for Credit Losses | (5) | (3) |  |  |  |
Gross Unrealized Gains | 52 | 32 |  |  |  |
Gross Unrealized Losses | (45) | (91) |  |  |  |
Bonds available for sale | 3,743 | 3,926 |  |  |  |
CLO/ABS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 6,052 | 5,143 |  |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |  |
Gross Unrealized Gains | 47 | 34 |  |  |  |
Gross Unrealized Losses | (29) | (44) |  |  |  |
Bonds available for sale | $ 6,070 | $ 5,133 |  |  |  |

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