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Other Financial Data - Schedule of Other Current Assets (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Other Financial Data [Abstract] |  |
Taxes receivable | $ 94 | $ 99
Deferred tax assets | 232 | 212
Prepaid expenses | 130 | 164
Deferred project costs | 92 | 102
Other | 18 | 25
Total Other Current Assets | $ 566 | $ 602

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