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Significant Accounting Policies (Condensed) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Loss on impairment of goodwill |  |  | $ 462 |  |
Loss on impairment of goodwill, tax effect |  |  | 0 |  |
Contract intangible assets | $ 554 |  | 554 |  |
Capitalized interest costs on construction work in progress | 8 | $ 31 | 28 | $ 91 |
Accounts receivable, net | 627 |  | 627 |  | $ 596
Other current assets | $ 169 |  | $ 169 |  | 157
Reclassifications |  |  |  |  |
Accounts receivable, net |  |  |  |  | (45)
Other current assets |  |  |  |  | $ 45

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