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v3.24.2.u1

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, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | $ 65,326 | $ 68,119 |  |  |  |
Allowance for credit losses |  | (33) | (34) | $ (28) | $ (34) | $ (28) | $ (37)
Gross Unrealized Gains |  | 847 | 1,073 |  |  |  |
Gross Unrealized Losses |  | (3,807) | (3,916) |  |  |  |
Bonds available for sale | [1] | 62,333 | 65,242 |  |  |  |
Non-Investment Grade |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Bonds available for sale |  | $ 4,800 | $ 5,200 |  |  |  |
Non-Investment Grade | Credit Concentration Risk | Bonds available for sale |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Concentration risk (as a percent) |  | 8.00% | 8.00% |  |  |  |
U.S. government and government sponsored entities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | $ 4,511 | $ 4,444 |  |  |  |
Allowance for credit losses |  | 0 | 0 |  |  |  |
Gross Unrealized Gains |  | 15 | 40 |  |  |  |
Gross Unrealized Losses |  | (117) | (89) |  |  |  |
Bonds available for sale |  | 4,409 | 4,395 |  |  |  |
Obligations of states, municipalities and political subdivisions |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | 4,635 | 4,930 |  |  |  |
Allowance for credit losses |  | 0 | 0 |  |  |  |
Gross Unrealized Gains |  | 32 | 60 |  |  |  |
Gross Unrealized Losses |  | (175) | (157) |  |  |  |
Bonds available for sale |  | 4,492 | 4,833 |  |  |  |
Non-U.S. governments |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | 8,649 | 8,973 |  |  |  |
Allowance for credit losses |  | 0 | (1) |  |  |  |
Gross Unrealized Gains |  | 67 | 94 |  |  |  |
Gross Unrealized Losses |  | (655) | (670) |  |  |  |
Bonds available for sale |  | 8,061 | 8,396 |  |  |  |
Corporate debt |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | 32,503 | 34,013 |  |  |  |
Allowance for credit losses |  | (24) | (20) |  |  |  |
Gross Unrealized Gains |  | 481 | 606 |  |  |  |
Gross Unrealized Losses |  | (2,173) | (2,253) |  |  |  |
Bonds available for sale |  | 30,787 | 32,346 |  |  |  |
Mortgage-backed, asset-backed and collateralized |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | 15,028 | 15,759 |  |  |  |
Allowance for credit losses |  | (9) | (13) |  |  |  |
Gross Unrealized Gains |  | 252 | 273 |  |  |  |
Gross Unrealized Losses |  | (687) | (747) |  |  |  |
Bonds available for sale |  | 14,584 | 15,272 |  |  |  |
RMBS |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | 6,041 | 6,423 |  |  |  |
Allowance for credit losses |  | (5) | (9) |  |  |  |
Gross Unrealized Gains |  | 197 | 219 |  |  |  |
Gross Unrealized Losses |  | (455) | (426) |  |  |  |
Bonds available for sale |  | 5,778 | 6,207 |  |  |  |
CMBS |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | 4,431 | 4,326 |  |  |  |
Allowance for credit losses |  | (4) | (4) |  |  |  |
Gross Unrealized Gains |  | 19 | 23 |  |  |  |
Gross Unrealized Losses |  | (159) | (198) |  |  |  |
Bonds available for sale |  | 4,287 | 4,147 |  |  |  |
CLO/ABS |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  | 4,556 | 5,010 |  |  |  |
Allowance for credit losses |  | 0 | 0 |  |  |  |
Gross Unrealized Gains |  | 36 | 31 |  |  |  |
Gross Unrealized Losses |  | (73) | (123) |  |  |  |
Bonds available for sale |  | $ 4,519 | $ 4,918 |  |  |  |
[1] | See Note 10 for details of balances associated with variable interest entities.

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