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Segment Information (Total Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 677,576 | $ 687,584
Group Benefits |  |
Segment Reporting Information [Line Items] |  |
Total assets | 37,076 | 36,715
RIS |  |
Segment Reporting Information [Line Items] |  |
Total assets | 217,290 | 218,587
Asia |  |
Segment Reporting Information [Line Items] |  |
Total assets | 154,296 | 157,206
Latin America |  |
Segment Reporting Information [Line Items] |  |
Total assets | 66,142 | 69,177
EMEA |  |
Segment Reporting Information [Line Items] |  |
Total assets | 18,742 | 18,596
MetLife Holdings |  |
Segment Reporting Information [Line Items] |  |
Total assets | 146,621 | 148,524
Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 37,409 | $ 38,779

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