Investments - Payables for Collateral on Investments (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Carrying Value | ||
| Collateral payable for derivative investments | $ 9,051 | $ 7,809 |
| Securities pledged under securities lending agreements | 181 | 145 |
| Total payables for collateral on investments | 9,232 | 7,954 |
| Fair Value | ||
| Collateral payable for derivative investments | 9,051 | 7,809 |
| Securities pledged under securities lending agreements | 174 | 139 |
| Total payables for collateral on investments | $ 9,225 | $ 7,948 |
| Percentage of the fair value of domestic securities obtained as collateral under securities lending agreements. | 102.00% | |
| Percentage of the fair value of foreign securities obtained as collateral under securities lending agreements. | 105.00% |