Fair Value of Financial Instruments - Components of the Transfers In and Out of Level 3 (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Corporate bonds | ||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] | ||
| Transfers Into Level 3 | $ 56 | $ 22 |
| Transfers Out of Level 3 | (776) | 0 |
| Total | (720) | 22 |
| CMBS | ||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] | ||
| Transfers Into Level 3 | 0 | 0 |
| Transfers Out of Level 3 | (9) | 0 |
| Total | (9) | 0 |
| ABS | ||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] | ||
| Transfers Into Level 3 | 24 | 57 |
| Transfers Out of Level 3 | (16) | 0 |
| Total | 8 | 57 |
| Trading securities | ||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] | ||
| Transfers Into Level 3 | 0 | 20 |
| Transfers Out of Level 3 | (22) | 0 |
| Total | $ (22) | $ 20 |