Deferred Policy Acquisition Costs Level 4 (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Deferred Policy Acquisition Costs Disclosures [Abstract]
Deferred Costs and Other Assets	$ 442	$ 481	$ 542	$ 521
Deferred Policy Acquisition Costs, Additions	7	5
Deferred Policy Acquisition Cost, Amortization Expense, Other	29	62
Deferred Policy Acquisition Cost, Amortization Expense, Assumption Change	71	11
Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss)	(7)	$ 28
Deferred Policy Acquisition Cost, Amortization Expense, Assumption Change	$ 101