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Equity (Statutory Net Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Metropolitan Life Insurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | $ 2,737 | $ 3,513 | $ 3,392
Statutory capital and surplus | 10,869 | 11,804 |
American Life Insurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | 824 | 48 | 980
Statutory capital and surplus | 5,040 | 5,584 |
Metropolitan Property and Casualty Insurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) |  |  | 336
Metropolitan Tower Life Insurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | 232 | 185 | (237)
Statutory capital and surplus | 1,896 | 1,638 |
Other |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | 91 | 76 | $ 84
Statutory capital and surplus | $ 209 | $ 193 |

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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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