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Other Financial Data - Schedule of Other Non-current Assets (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Other Financial Data [Abstract] |  |
Prepaid pension | $ 923 | $ 933
Deferred project costs | 220 | 250
Deferred tax assets | 125 | 144
Investments | 136 | 143
Taxes receivable | 70 | 101
Other | 199 | 233
Total | $ 1,673 | $ 1,804

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