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Equity Equity (Dividend Restrictions) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Parent Company        
Dividends Payable [Line Items]        
Payments of Dividends $ 0 $ 0 $ 0  
Parent Company | Forecast [Member]        
Dividends Payable [Line Items]        
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval       $ 2,066
Brighthouse Life Insurance Co of NY        
Dividends Payable [Line Items]        
Payments of Dividends $ 28 $ 0 $ 0  
Brighthouse Life Insurance Co of NY | Forecast [Member]        
Dividends Payable [Line Items]        
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval       $ 0