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Market Risk Benefits - Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Market Risk Benefit [Line Items] |  |  |  |  |
Asset | $ 286 | $ 280 |  |  |
Liability | 3,179 | 3,763 |  | $ 7,901 |
Net | 2,893 | 3,483 |  |  |
Retirement Assurance | Asia |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Asset | 0 | 0 |  |  |
Liability | 203 | 226 |  |  |
Net | 203 | 226 | $ 277 |  | $ 318
Investment Product | MetLife Holdings |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Asset | 156 | 153 |  |  |
Liability | 2,878 | 3,378 |  |  |
Net | 2,722 | 3,225 |  |  |
Insurance, Other |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |
Asset | 130 | 127 |  |  |
Liability | 98 | 159 |  |  |
Net | $ (32) | $ 32 | $ 491 |  | $ 582

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- Definition Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480112/944-40-45-3 + Details
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- Definition Amount of asset position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B + Details
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