Investments - Schedule of Increase (Decrease) in Payables for Collateral on Investments (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Investments [Abstract] | ||
| Collateral payable for derivative investments | $ 1,242 | $ (2,210) |
| Securities pledged under securities lending agreements | 36 | (2) |
| Securities pledged under repurchase agreements | 0 | 418 |
| Investments pledged for FHLB lending program | 0 | 240 |
| Total increase (decrease) in payables for collateral on investments | $ 1,278 | $ (1,554) |