Reserve for Unpaid Losses and Loss Adjustment Expenses - EB Additional information (Details) - Group Insurance Policy [Member] - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Prior incurral year development [1] | $ (339) | $ (486) |
| Disability Insurance Policy [Member] | ||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Prior incurral year development [1] | 292 | 403 |
| group life term, disability and accident [Member] | ||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Prior incurral year development [1] | $ 49 | $ 81 |