Income Taxes Level 4 Capital Loss Carryover (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	$ 325	$ 325	$ 491
Operating Loss Carryforwards, Valuation Allowance	112	112	172
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	60	60
Unrecognized Tax Benefits	12	12	48
Expiring Tax Year 2019 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	318	318
Expiring Tax Year 2020 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	7	7
Before Tax [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	$ 114	$ 114	$ 172