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Income Taxes, Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Income Tax [Line Items]    
Income taxes receivable $ 10 $ 70
Federal    
Income Tax [Line Items]    
Income taxes receivable 7 67
State    
Income Tax [Line Items]    
Income taxes receivable $ 3 $ 3