Document and Entity Information - USD ($)
6 Months Ended
Jun. 30, 2018
Aug. 07, 2018
Jun. 30, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name BRIGHTHOUSE FINANCIAL, INC.    
Entity Central Index Key 0001685040    
Document Type 10-Q    
Document Period End Date Jun. 30, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus Q2    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   119,782,668