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, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Fixed maturity securities | |||
| Gross Realized Gains | $ 120 | $ 894 | $ 1,022 |
| Gross Realized Losses | 677 | 144 | 440 |
| Net Investment Income [Line Items] | |||
| Aggregate fair value of available for sale securities sold | 10,000 | 11,400 | 12,000 |
| Net realized gains (losses) | (557) | 750 | 582 |
| Fortitude RE Funds Withheld Assets | |||
| Net Investment Income [Line Items] | |||
| Net realized gains (losses) | $ (232) | $ 647 | $ 660 |