Deferred Policy Acquisition Costs, Deferred Reinsurance, Deferred Sales Inducements and Value of Business Acquired (Balance of and Changes in VOBA) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Movement in Present Value of Future Insurance Profits [Roll Forward] | ||
| Balance, BOP | $ 397 | |
| Balance, EOP | 382 | |
| Gibraltar Life and Other | ||
| Movement in Present Value of Future Insurance Profits [Roll Forward] | ||
| Balance, BOP | 384 | $ 421 |
| Amortization expense | (9) | (10) |
| Foreign currency adjustment | (5) | 20 |
| Balance, EOP | 370 | 431 |
| Other businesses | ||
| Movement in Present Value of Future Insurance Profits [Roll Forward] | ||
| Balance, EOP | 12 | 15 |
| Gibraltar Life and Other And Other Businesses | ||
| Movement in Present Value of Future Insurance Profits [Roll Forward] | ||
| Balance, EOP | $ 382 | $ 446 |