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Risks and Uncertainties (Notes) | 3 Months Ended
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Mar. 31, 2018
Unusual Risk or Uncertainty [Line Items] |
Unusual Risks and Uncertainties [Table Text Block] | RISKS AND UNCERTAINTIES Alto Maipo — As discussed in Item 8—Financial Statements and Supplementary Data of the 2017 Form 10-K, Alto Maipo, a hydroelectric facility near Santiago Chile, has experienced construction difficulties which have resulted in increased projected costs over the original $2 billion budget. In May 2018, Alto Maipo and the project’s senior lenders signed all agreements related to the financial restructuring of the project, which will become effective upon the completion of customary conditions. If Alto Maipo is unable to meet certain construction milestones, there could be a material impact to the financing and value of the project. For additional information on risks regarding construction and development, refer to Item 1A.—Risk Factors—Our Business is Subject to Substantial Development Uncertainties of the 2017 Form 10-K. The carrying value of the long-lived assets and deferred tax assets of Alto Maipo as of March 31, 2018 was approximately $1.5 billion and $55 million, respectively.

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