Investments (Net Unrealized Gains Losses on Investments) (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gains (losses) on investments | $ (31,125) | $ (26,645) |
| Fixed maturities | Available-for-sale | With an allowance | ||
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gains (losses) on investments | 14 | (4) |
| Fixed maturities | Available-for-sale | Without an allowance | ||
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gains (losses) on investments | (31,233) | (26,354) |
| Derivatives designated as cash flow hedges | ||
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gains (losses) on investments | 141 | (231) |
| Derivatives designated as fair value hedges | ||
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gains (losses) on investments | (136) | (123) |
| Other investments | ||
| Gain (Loss) on Securities [Line Items] | ||
| Net unrealized gains (losses) on investments | $ 89 | $ 67 |