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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Reinsurance Disclosures [Abstract]    
Deposit assets in premiums, reinsurance, and other receivables or secondary guarantee risk for reinsurance $ 3,100 $ 2,300
Deposit liabilities in other liabilities for reinsurance 32 33
Ceded Credit Risk [Line Items]    
Reinsurance recoverables $ 14,600 15,300
Mortality Risk [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 90.00%  
Retention amount $ 2  
Mortality Risk on Case by Case Basis [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 100.00%  
Retention amount $ 20  
Quota Share Reinsurance for Certain Disability Business [Member]    
Reinsurance Retention Policy [Line Items]    
Reinsured risk percentage 100.00%  
Mortality Risk on Yearly Renewable Term Basis [Member]    
Reinsurance Retention Policy [Line Items]    
Retention amount $ 5  
Modified Coinsurance of Closed Block [Member]    
Reinsurance Retention Policy [Line Items]    
Reinsured risk percentage 59.25%  
Ceded Credit Risk, Unsecured [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance recoverables $ 6,100 6,100
MetLife Holdings | Living And Death Benefit Guarantees [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 100.00%  
MetLife Holdings | Variable Annuity [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 100.00%  
Brighthouse Financial | Mortality Risk [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 90.00%  
Retention amount $ 2  
Brighthouse Financial | Mortality Risk on Case by Case Basis [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 100.00%  
Retention amount $ 20  
Brighthouse Financial | Living And Death Benefit Guarantees [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 100.00%  
Brighthouse Financial | Variable Annuity [Member]    
Reinsurance Retention Policy [Line Items]    
Percentage of reinsured risk in excess of stated amount 100.00%  
Five Largest Ceded Reinsurers [Member]    
Ceded Credit Risk [Line Items]    
Five largest reinsurers, reinsurance recoverables amount $ 9,800 $ 10,800
Five largest reinsurers, reinsurance recoverables percentage 67.00% 71.00%
Five Largest Ceded Reinsurers [Member] | Ceded Credit Risk, Unsecured [Member]    
Ceded Credit Risk [Line Items]    
Five largest reinsurers, reinsurance recoverables amount $ 2,300 $ 2,300