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Income Taxes Level 4 Capital Loss Carryover (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]        
Deferred Tax Assets, Capital Loss Carryforwards $ 53 $ 78    
Operating Loss Carryforwards, Valuation Allowance 53 78    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 0      
Unrecognized Tax Benefits 12 $ 12 $ 48 $ 48
Expiring Tax Year 2019 [Member]        
Operating Loss Carryforwards [Line Items]        
Deferred Tax Assets, Capital Loss Carryforwards $ 151