Future Policy Benefits - FPB Income Statement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	$ 19,486	$ 18,257	$ 23,478
Interest Expense (2)	5,695	5,393	4,930
Fixed & Immediate Annuities | RIS
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	8,084	6,660	12,748
Interest Expense (2)	3,146	2,897	2,519
Whole and Term Life & Endowments | Asia
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	1,130	1,124	1,144
Interest Expense (2)	298	311	320
Accident & health insurance | Asia
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	3,066	3,364	3,602
Interest Expense (2)	247	249	248
Fixed Annuity | Latin America
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	1,041	1,074	712
Interest Expense (2)	318	312	289
Long-term Care | MetLife Holdings
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	724	731	734
Interest Expense (2)	804	776	745
Fixed & Immediate Annuities for Deferred Profit Liabilities | RIS
Principal Transaction Revenue [Line Items]
Interest Expense (2)	178	167	154
Whole and Term Life & Endowments for Deferred Profit Liabilities | Asia
Principal Transaction Revenue [Line Items]
Interest Expense (2)	36	31	26
Accident and Health Insurance Product Line for Deferred Profit Liabilities | Asia
Principal Transaction Revenue [Line Items]
Interest Expense (2)	20	18	16
Fixed Annuity for Deferred Profit Liabilities | Latin America
Principal Transaction Revenue [Line Items]
Interest Expense (2)	20	22	19
Variable Life | Asia
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	117	89	58
Interest Expense (2)	17	19	21
Universal and Variable Universal Life | Asia
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	(35)	(31)	(26)
Interest Expense (2)	6	7	7
Universal and Variable Universal Life | MetLife Holdings
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	642	730	805
Interest Expense (2)	132	124	116
Long-Duration Insurance, Other
Principal Transaction Revenue [Line Items]
Gross Premiums or Assessments (1)	4,717	4,516	3,701
Interest Expense (2)	$ 473	$ 460	$ 450