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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

X

- Definition

Represents the tax effect loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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