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	$ 463	$ 542	$ 521	$ 689
Deferred Policy Acquisition Costs and Present Value of Future Profits, Additions	7	7	14
Deferred Policy Acquisition Cost, Amortization Expense	40	82	110
Deferred Policy Acquisition Cost, Amortization Expense, Effect of Adjustments to Estimated Gross Profit or Estimated Gross Margin	74	(13)	96
Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss)	$ 28	$ 83	$ 24