Investments - Gross realized gains and gross realized losses from sales or maturities of available for sale securities (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Fixed maturity securities | |||
| Gross Realized Gains | $ 85 | $ 80 | $ 100 |
| Gross Realized Losses | (894) | (1,274) | (451) |
| Net Investment Income [Line Items] | |||
| Aggregate fair value of available for sale securities sold | 13,500 | 7,900 | 7,600 |
| Net realized gains (losses) | (809) | (1,194) | (351) |
| Fortitude RE Funds Withheld Assets | |||
| Net Investment Income [Line Items] | |||
| Net realized gains (losses) | $ (20) | $ (53) | $ (73) |