Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ (1,423)	$ (1,386)
Operating Income (Loss)	(39)	(214)
Depreciation and Amortization	147	208
Corporate General and Administrative	(38)	(39)
Restructuring Charges	(25)	(75)
Overstatement (reduction) of revenues	(1,423)	(1,386)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	(1,423)	(1,386)
Operating Income (Loss)	40	(89)
Depreciation and Amortization	146	206
Overstatement (reduction) of revenues	(1,423)	(1,386)
Operating Segments \| Western Hemisphere
Segment Reporting Information [Line Items]
Revenues	(756)	(733)
Operating Income (Loss)	24	(30)
Depreciation and Amortization	60	91
Overstatement (reduction) of revenues	(756)	(733)
Operating Segments \| Eastern Hemisphere
Segment Reporting Information [Line Items]
Revenues	(667)	(653)
Operating Income (Loss)	16	(59)
Depreciation and Amortization	86	115
Overstatement (reduction) of revenues	(667)	(653)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	1	2
Corporate General and Administrative	(36)	(33)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Restructuring Charges	(25)	(75)
Impairment of Long-Lived Assets and Other Related Charges	$ (18)	$ (17)

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Impairment of Long-Lived Assets and Other Related Charges

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