Supplemental Cash Flow Information - Schedule of Activities Resulting from Management of Proceeds (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Net change in proceeds managed | ||
| Net change in fixed income securities | $ (441) | $ (99) |
| Net change in short-term investments | 232 | 282 |
| Operating cash flow (used) provided | (209) | 183 |
| Net change in cash | 0 | (1) |
| Net change in proceeds managed | (209) | 182 |
| Net change in liabilities | ||
| Liabilities for collateral, beginning of period | (1,934) | (2,041) |
| Liabilities for collateral, end of period | (2,143) | (1,859) |
| Operating cash flow provided (used) | $ 209 | $ (182) |