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Income Taxes Level 4 Net Operating Loss Carryover (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration $ 91 $ 0
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 1,618 1,894
Deferred Tax Assets, Capital Loss Carryforwards 32 0
Expiring Tax Year 2020 [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration $ 1  
Earliest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2020  
Tax Credit Carryforward, Expiration Date Dec. 31, 2021  
Latest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2036  
Tax Credit Carryforward, Expiration Date Dec. 31, 2035  
Expiring within Tax Years 2023 to 2036 [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration $ 4,623  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 4,624 5,412
Foreign Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 3 48
Deferred Tax Assets, Operating Loss Carryforwards $ 0 $ 9