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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
Segment Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 1,215	$ 1,215	$ 1,346	$ 1,346
Operating Income (Loss)	(822)		(301)
Depreciation and Amortization	157		123
Goodwill Impairment	(167)	$ (167)	(229)
Restructuring Charges	(36)		(69)
Western Hemisphere
Segment Reporting Information [Line Items]
Goodwill Impairment	0
Eastern Hemisphere
Segment Reporting Information [Line Items]
Goodwill Impairment	(167)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,215		1,346
Operating Income (Loss)	47		29
Depreciation and Amortization	156		120
Operating Segments \| Western Hemisphere
Segment Reporting Information [Line Items]
Revenues	588		726
Operating Income (Loss)	29		9
Depreciation and Amortization	47		48
Operating Segments \| Eastern Hemisphere
Segment Reporting Information [Line Items]
Revenues	627		620
Operating Income (Loss)	18		20
Depreciation and Amortization	109		72
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Depreciation and Amortization	1		3
Corporate General and Administrative	26		$ 32
Segment Reconciling Items
Segment Reporting Information [Line Items]
Impairment of Long-Lived Assets and Other Related Charges	640
Restructuring Charges	$ (36)