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Other Financial Data - Schedule of Other Non-current Assets (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Other Financial Data [Abstract] |  |
Deferred project costs | $ 205 | $ 210
Investments | 131 | 135
Taxes receivable | 81 | 82
Other | 162 | 165
Total | $ 579 | $ 592

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