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Other Financial Data - Schedule of Other Current Assets (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Other Financial Data [Abstract] |  |
Taxes receivable | $ 146 | $ 94
Prepaid expenses | 152 | 130
Deferred project costs | 94 | 92
Other | 3 | 13
Total | $ 395 | $ 329

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