Derivative Instruments - Narrative (Details) - USD ($) $ in Millions |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Derivative [Line Items] | |||
| Derivative assets by counterparty | $ 18 | $ 151 | |
| Derivative assets, held collateral | 7 | 130 | |
| Derivative liabilities by counterparty | 1,209 | 237 | |
| Derivative liabilities, held collateral | 1,200 | 295 | |
| Derivative disbursement obligation | 9 | 0 | |
| Derivative claim | 12 | 79 | |
| Derivative asset, pledged collateral | 2,131 | 1,403 | |
| Derivative instrument, deferred option premiums | 464 | $ 229 | |
| Embedded derivatives | |||
| Derivative [Line Items] | |||
| Net fair value, derivative asset (liability) | (9,468) | (6,906) | |
| Derivatives related to funds withheld under reinsurance treaties | |||
| Derivative [Line Items] | |||
| Net fair value, derivative asset (liability) | 1,985 | 1,748 | |
| Derivatives related to funds withheld under reinsurance treaties | Funds withheld embedded derivative | |||
| Derivative [Line Items] | |||
| Net fair value, derivative asset (liability) | $ 1,983 | $ 1,752 | |