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Long-term and Short-term Debt (Credit Facilities) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Collateral financing arrangement | $ 716 | $ 766
General Credit Facility Three [Member] |  |
Debt Instrument [Line Items] |  |
Borrowers | MetLife, Inc. and MetLife Funding, Inc. |
Line of Credit Facility, Maximum Borrowing Capacity | $ 3,000 |
Letters of Credit Issued | 263 |
Collateral financing arrangement | 0 |
Unused Commitments | $ 2,737 |

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