Derivative Instruments - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Derivative [Line Items] | |||
| Derivative assets by counterparty | $ 209 | $ 151 | |
| Derivative assets, held collateral | 487 | 130 | |
| Derivative liabilities by counterparty | 92 | 237 | |
| Derivative liabilities, held collateral | 119 | 295 | |
| Derivative disbursement obligation | 278 | 0 | |
| Derivative claim | 27 | 79 | |
| Derivative asset, pledged collateral | 1,625 | 1,403 | |
| Derivative instrument, deferred option premiums | 223 | $ 0 | |
| Embedded derivatives | |||
| Derivative [Line Items] | |||
| Net fair value, derivative asset (liability) | (6,317) | (6,906) | |
| Derivatives related to funds withheld under reinsurance treaties | |||
| Derivative [Line Items] | |||
| Net fair value, derivative asset (liability) | 1,772 | 1,748 | |
| Derivatives related to funds withheld under reinsurance treaties | Funds withheld embedded derivative | |||
| Derivative [Line Items] | |||
| Net fair value, derivative asset (liability) | $ 1,765 | $ 1,752 | |