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Investments (Related Party Investment Transactions - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 28, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Related Party Transaction [Line Items]            
Equity Method Investments       $ 89    
Proceeds from Sale of Equity Method Investments       286    
Adjustments To Additional Paid In Capital, Capital Contribution       202    
Related party investment administrative services   $ 254 $ 240   $ 501 $ 432
Other investments            
Related Party Transaction [Line Items]            
Debt Instrument, Face Amount       $ 1,100    
Increase (Decrease) in Notes Receivable, Related Parties $ 1,100          
Other investments | Related Party Loan One [Member]            
Related Party Transaction [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   4.21%     4.21%  
Debt Instrument, Maturity Date         Sep. 30, 2032  
Other investments | Related Party Loan Two [Member]            
Related Party Transaction [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   5.10%     5.10%  
Debt Instrument, Maturity Date         Dec. 31, 2033  
Metlife Investment Advisors, LLC [Member]            
Related Party Transaction [Line Items]            
Related party investment administrative services   $ 26 $ 23   $ 49 $ 48