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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common stock par value per share $ 1 $ 1
Common Stock, Shares Authorized 1,000 1,000
Common Stock, Shares issued 505 505
Accumulated depreciation $ 91 $ 59