Investments - Schedule of Net Appreciation (Decline) Recognized in Net Income (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Debt and Equity Securities, FV-NI [Line Items] | ||||
| Total | $ 117 | $ 35 | $ 96 | $ 125 |
| Equity securities | ||||
| Debt and Equity Securities, FV-NI [Line Items] | ||||
| Total | 129 | 18 | 125 | 78 |
| Limited partnership interests carried at fair value | ||||
| Debt and Equity Securities, FV-NI [Line Items] | ||||
| Total | $ (12) | $ 17 | $ (29) | $ 47 |