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Other Financial Data Schedule of Other Current Assets (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Other Financial Data [Abstract] |  |
Prepaid expenses | $ 219 | $ 229
Taxes receivable | 130 | 111
Deferred project costs | 102 | 98
Deferred tax assets | 81 | 93
Other | 45 | 32
Other Assets, Current | $ 577 | $ 563

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