Investments (Components of Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Net Investment Gains (Losses) [Line Items] | ||
| Net investment gains (losses) | $ (52) | $ (81) |
| Fixed maturity securities | ||
| Net Investment Gains (Losses) [Line Items] | ||
| Net investment gains (losses) | (40) | (34) |
| Equity securities | ||
| Net Investment Gains (Losses) [Line Items] | ||
| Net investment gains (losses) | 0 | (1) |
| Mortgage loans | ||
| Net Investment Gains (Losses) [Line Items] | ||
| Net investment gains (losses) | (10) | (43) |
| Limited partnerships and LLCs | ||
| Net Investment Gains (Losses) [Line Items] | ||
| Net investment gains (losses) | 0 | (1) |
| Other | ||
| Net Investment Gains (Losses) [Line Items] | ||
| Net investment gains (losses) | $ (2) | $ (2) |