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Risks And Uncertainties (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) MWh segment business customer | Dec. 31, 2015 USD ($) customer | Jan. 01, 2015 USD ($) | Dec. 31, 2014 USD ($) customer | Jan. 01, 2014 USD ($)
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Number of strategic business units | segment | 6 |  |  |  |
Segment Reporting, Additional Information about Entity's Reportable Segments | business | 2 |  |  |  |
Cash and cash equivalents | $ | $ 1,305 | $ 1,257 | $ 1,517 | $ 1,517 | $ 1,636
Percent of revenue generated outside US | 74.00% |  |  |  |
Number of customers that accounted for 10% of more of total revenue | customer | 0 | 0 |  | 0 |
Percentage of total revenues from a single customer (less than) | 10.00% |  |  |  |
Alto Maipo [Member] |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Megawatts under construction | MWh | 531 |  |  |  |

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