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Income Taxes Level 4 Net Operating Loss Carryover (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic   $ 1,814
Tax Credit Carryforward, Valuation Allowance $ 1 1
Deferred Tax Assets, Operating Loss Carryforwards, Foreign   17
Earliest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2016  
Expiring within Tax Years 2016 to 2020 [Domain]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration $ 4  
Latest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2033  
Expiring within Tax Years 2023 to 2033 [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration $ 5,093  
No expiration tax year [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 88  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 5,097  
Deferred Tax Assets, Operating Loss Carryforwards 1,784  
Operating Loss Carryforwards   5,182
Foreign Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 88  
Deferred Tax Assets, Operating Loss Carryforwards 17  
Operating Loss Carryforwards   89
Before Tax [Member]    
Operating Loss Carryforwards [Line Items]    
Tax Credit Carryforward, Amount $ 151 $ 222