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Condensed Financial Information (Parent Company) (Support Agreements - Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items] |  |
Derivative Liability, Fair Value, Amount Offset Against Collateral | $ 19 | $ 25
Parent Company | Support Agreement Exeter Obligations [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Amount guaranteed under support agreement | $ 1,000 |
Parent Company | Support Agreement MetLife Reinsurance Company of Vermont [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Guaranteed adjusted capital levels | 200 |
Parent Company | Support Agreement MetLife Reinsurance Company of Charleston [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Guaranteed adjusted capital levels | 200 |
Parent Company | Support Agreement - Guarantees of Subsidiary Derivative Obligations [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Derivative Assets, Fair Value, Net | $ 27 | 174
Unsecured derivative liability positions guaranteed by MetLife, Inc. | 191 | 181
Estimated fair value of collateral provided to counterparties by the subsidiaries | 183 | 181
Derivative Liability, Fair Value, Amount Offset Against Collateral | $ 8 | $ 0

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