Investments - Gross realized gains and gross realized losses from sales or maturities of available for sale securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Fixed maturity securities | ||||
| Gross Realized Gains | $ 12 | $ 38 | $ 15 | $ 84 |
| Gross Realized Losses | (554) | (279) | (899) | (418) |
| Net Investment Income [Line Items] | ||||
| Aggregate fair value of available for sale securities sold | 2,500 | 3,000 | 5,000 | 5,700 |
| Net realized gains (losses) | (542) | (241) | (884) | (334) |
| Fortitude RE Funds Withheld Assets | ||||
| Net Investment Income [Line Items] | ||||
| Net realized gains (losses) | $ (49) | $ (46) | $ (71) | $ (63) |