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Income Taxes (Net Operating Losses and Credits) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]    
U.S. Federal Tax credits $ 7 $ 7
Federal Tax Authority    
Operating Loss Carryforwards [Line Items]    
Net Operating Loss Carryforward, Subject to Expiration 2  
U.S. Federal Tax credits 7  
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Net Operating Loss Carryforward, Subject to Expiration 3  
Net Operating Loss Carryforward, Not Subject to Expiration 34  
State and local jurisdiction    
Operating Loss Carryforwards [Line Items]    
Net Operating Loss Carryforward, Subject to Expiration $ 1