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Deferred Policy Acquisition Costs and Present Value of Future Profits Level 4 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]        
Deferred Policy Acquisition Costs and Value of Business Acquired $ 1,711 $ 1,816 $ 1,823 $ 2,161
Deferred Policy Acquisition Costs and Present Value of Future Profits, Additions 1,390 1,390 1,364  
Deferred Policy Acquisition Cost, Amortization Expense 1,502 1,571 1,593  
Deferred Policy Acquisition Cost, Amortization Expense, Effect of Adjustments to Estimated Gross Profit or Estimated Gross Margin 21 (69) 136  
Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss) $ 28 $ 105 $ 27