Investments - Schedule of Increase (Decrease) in Payables for Collateral on Investments (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Investments [Abstract] | ||
| Collateral payable for derivative investments | $ (1,436) | $ (1,655) |
| Securities pledged under securities lending agreements | 38 | 10 |
| Securities pledged under repurchase agreements | 0 | 57 |
| Investments pledged for FHLB lending program | 0 | (150) |
| Total increase (decrease) in payables for collateral on investments | $ (1,398) | $ (1,738) |