Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss | ||
| Fixed maturity securities | $ (5,909) | $ (4,968) |
| Derivatives | 323 | 224 |
| Other | (10) | (9) |
| Subtotal | (5,596) | (4,753) |
| Amounts allocated from: Future policy benefits | 524 | 525 |
| Deferred income tax benefit (expense) | 1,065 | 888 |
| Net unrealized investment gains (losses) | $ (4,007) | $ (3,340) |