v3.22.2.2
Document and Entity Information
Nov. 15, 2022
Document And Entity Information [Line Items]  
Entity Registrant Name METLIFE INC
Amendment Flag false
Entity Central Index Key 0001099219
Document Type 8-K
Document Period End Date Nov. 15, 2022
Entity Incorporation State Country Code DE
Entity File Number 1-15787
Entity Tax Identification Number 13-4075851
Entity Address, Address Line One 200 Park Avenue
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10166-0188
City Area Code (212)
Local Phone Number 578-9500
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $0.01
Trading Symbol MET
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Floating Rate Non-Cumulative Preferred Stock,Series A, par value $0.01
Trading Symbol MET PRA
Security Exchange Name NYSE
Series E Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/1,000th interest in a share of 5.625% Non-CumulativePreferred Stock, Series E
Trading Symbol MET PRE
Security Exchange Name NYSE
Series F Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/1,000th interest in a share of 4.75% Non-CumulativePreferred Stock, Series F
Trading Symbol MET PRF
Security Exchange Name NYSE