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Other Non-Operating Expense Other Non-Operating Expense	12 Months Ended
Other Non-Operating Expense Other Non-Operating Expense	Dec. 31, 2016
Other Income and Expenses [Abstract]
OTHER NON-OPERATING EXPENSE	OTHER NON-OPERATING EXPENSE There were no significant non-operating expenses for the years ended December 31, 2016 or 2015. Entek — During 2014, the Company executed an agreement to sell its 49.62% interest in Entek, an investment accounted for under the equity method, for $125 million. Entek consists of natural gas and hydroelectric generation facilities, plus a coal-fired development project. The Company determined that there was an other-than-temporary decline in the fair value of its equity method investment in Entek and recognized pretax impairment expense of $86 million. The sale of the Company's interest in Entek closed on December 18, 2014. Silver Ridge — During 2014, the Company determined that there was a decline in the fair value of its equity method investment in Silver Ridge Power, LLC ("SRP") that was other-than-temporary based on indications about the fair value of the projects in Italy and Spain that resulted from actual and proposed changes to tariffs. Accordingly, the Company recognized pretax impairment expense of $42 million. The transaction related to our 50% ownership interest in SRP closed on July 2, 2014 for $179 million. See Note 7—Investments in and Advances to Affiliates of this Form 10-K for further information.