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Schedule I Condensed Balance Sheets (Paranthetical) - $ / shares
shares in Millions
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value $ 0 $ 0
Common stock, shares authorized 115 115
Common stock, shares issued 77 77
Common stock, shares outstanding 77 77
Parent Company [Member]    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value $ 0 $ 0
Common stock, shares authorized 115 115
Common stock, shares issued 77 77
Common stock, shares outstanding 77 77