CONDENSED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares shares in Millions	Sep. 30, 2016	Dec. 31, 2015	[1]
Statement of Financial Position [Abstract]
Common stock - par value (in dollars per share)	$ 2.5	$ 2.5
Shares authorized	9.2	9.2
Shares outstanding	9.2	9.2

[1] Derived from 2015 audited financial statements