Segment Information Segment Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 261	$ 985	$ 1,314	$ 1,309	$ 1,346	$ 1,429	$ 1,444	$ 1,448	$ 1,423	$ 4,954	$ 4,954	$ 5,744	$ 5,699
Operating Income (Loss)	1									(1,182)		(2,084)	(2,170)
Depreciation and Amortization	34									447		556	801
Capital Expenditures for Property, Plant and Equipment	(20)									(250)		(186)	(225)
Goodwill, Impairment Loss	0		$ (399)	(102)	$ (229)	(1,900)				(730)		(1,917)	0
Prepetition Charges	0			76						86	86	0	0
Corporate General and Administrative	5									118		130	130
Long-Lived Asset Impairments	0									20		151	928
Accounts Receivable, Allowance for Credit Loss, Writeoff	0									0		0	230
Gain (Loss) on Disposition of Business	0									15		0	0
Long-lived Assets	2,448	2,448				2,188					2,448	2,188
Restructuring Charges	0			61						189		126	183
Gain (Loss) on Disposition of Business	0			$ 114						(112)		0	96
Total Assets	7,293	7,293				6,601					7,293	6,601
Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss										(222)		(537)
Total Assets	4,392	4,392				2,966					4,392	2,966
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total Assets	387	387				513					387	513
Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss										(508)		(1,380)
Total Assets	2,514	2,514				3,122					2,514	3,122
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	261									4,954		5,744	5,699
Operating Income (Loss)	6									188		327	(252)
Depreciation and Amortization	34										440	549	795
Capital Expenditures for Property, Plant and Equipment	(16)										(228)	(168)	(200)
Operating Segments [Member] | Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Revenues	140									2,334		2,681	2,762
Operating Income (Loss)	10									134		119	(139)
Depreciation and Amortization	20									269		333	443
Capital Expenditures for Property, Plant and Equipment	(7)									(115)		(87)	(130)
Operating Segments [Member] | Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Revenues	121									2,620		3,063	2,937
Operating Income (Loss)	(4)									54		208	(113)
Depreciation and Amortization	14									171		216	352
Capital Expenditures for Property, Plant and Equipment	(9)									(113)		(81)	(70)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	0									7		7	6
Capital Expenditures for Property, Plant and Equipment	(4)									(22)		(18)	(25)
Corporate General and Administrative	5									118		130	130
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss										(730)		(1,917)
Prepetition Charges										86
Loss Contingency Accrual, Provision										374		238	1,711
Gain (Loss) on Disposition of Business										15
Restructuring Charges										189		(126)	183	[1]
Litigation Charges, Net													(10)
Gain (Loss) on Disposition of Business										112			96
Assets, Total [Member]
Segment Reporting Information [Line Items]
Long-Lived Asset Impairments												87	506
Transformation Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0									189	189
Transformation Plan [Member] | Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0									50
Transformation Plan [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0									55
Transformation Plan [Member] | Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0									$ 84
2016-17 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges												126
2016-17 Plan [Member] | Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Restructuring Charges												45
2016-17 Plan [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Restructuring Charges												54
2016-17 Plan [Member] | Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Restructuring Charges												27
2016 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges													183
2016 Plan [Member] | Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Restructuring Charges													77
2016 Plan [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Restructuring Charges													36
2016 Plan [Member] | Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Restructuring Charges													70
UNITED STATES
Segment Reporting Information [Line Items]
Revenues													$ 1,600
Total Assets	$ 1,200	$ 1,200				$ 1,600					$ 1,200	$ 1,600

[1] (j) Includes restructuring charges of $183 million: $70 million in the Western Hemisphere, $77 million in the Eastern Hemisphere and $36 million in Corporate.