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BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Capitalization, Long-term Debt and Equity [Abstract]    
Common stock, shares authorized (in shares) 200 200
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares outstanding (in shares) 100 100