Significant Accounting Policies Common Stock Repurchase Authorizations (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Apr. 30, 2025 |
May 01, 2024 |
May 25, 2023 |
May 03, 2023 |
|---|---|---|---|---|---|
| MetLife, Inc. [Member] | |||||
| Common Stock Repurchase Authorizations [Line Items] | |||||
| Share Repurchase Program, Authorized, Amount | $ 3,000 | $ 3,000 | $ 1,000 | $ 3,000 | |
| April2025Authorization | |||||
| Common Stock Repurchase Authorizations [Line Items] | |||||
| Share Repurchase Program, Remaining Authorized, Amount | $ 2,072 | ||||
| May2024Authorization | |||||
| Common Stock Repurchase Authorizations [Line Items] | |||||
| Share Repurchase Program, Remaining Authorized, Amount | 0 | ||||
| May2023Authorization2 | |||||
| Common Stock Repurchase Authorizations [Line Items] | |||||
| Share Repurchase Program, Remaining Authorized, Amount | 0 | ||||
| May2023Authorization | |||||
| Common Stock Repurchase Authorizations [Line Items] | |||||
| Share Repurchase Program, Remaining Authorized, Amount | $ 0 |