Segment Information Segment Information (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Operating Revenues		$ 1,490	$ 1,460	$ 1,363	$ 1,386	$ 1,406	$ 1,356	$ 1,402	$ 1,585	$ 5,699	$ 5,749	$ 9,433
Long-lived Assets		2,893				4,629				2,893	4,629
Operating Income (Loss)										(2,129)	(2,251)	(1,546)
Depreciation and Amortization										801	956	1,200
Capital Expenditures for Property, Plant and Equipment										(225)	(204)	(682)
Research and Development Expense										(158)	(159)	(231)
Equity Investment Impairment												(25)
Severance and Restructuring Charges										(183)	(280)	(232)
Litigation Charges, Net										10	(220)	(116)
Gain (Loss) on Disposition of Business										96	0	(6)
Gain (Loss) on Disposition of Business										91	10	(30)
Total Assets		9,747				12,664				9,747	12,664
Inventory Write-down										540	269	244
Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Total Assets		4,311				5,491				4,311	5,491
Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Total Assets		$ 4,933				$ 6,167				4,933	6,167
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues										5,699	5,749	9,433
Operating Income (Loss)										(258)	(569)	(153)
Depreciation and Amortization										795	947	1,184
Capital Expenditures for Property, Plant and Equipment										(200)	(189)	(663)
Operating Segments [Member] | Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues										2,762	2,807	4,157
Operating Income (Loss)										(143)	(160)	27
Depreciation and Amortization										443	501	563
Capital Expenditures for Property, Plant and Equipment										(130)	(134)	(273)
Operating Segments [Member] | Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues										2,937	2,942	5,276
Operating Income (Loss)										(115)	(409)	(180)
Depreciation and Amortization										352	446	621
Capital Expenditures for Property, Plant and Equipment										(70)	(55)	(390)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization										6	9	16
Capital Expenditures for Property, Plant and Equipment										(25)	(15)	(19)
Research and Development Expense										(130)	(139)	(194)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Equity Investment Impairment												(25)
Severance and Restructuring Charges										(183)	(280)	(232)	[1]
Litigation Charges, Net										10	(220)	(116)
Gain (Loss) on Disposition of Business												(6)
Loss Contingency Accrual, Provision										1,664	$ 1,043	768
Gain (Loss) on Disposition of Business										$ 96
Other Nonoperating Expense	[2]											$ 52

[1] Includes restructuring charges of $232 million: $94 million in the Western Hemisphere, $123 million in the Eastern Hemisphere and $15 million in Corporate.

[2] Includes $17 million in professional and other fees, $11 million in divestiture related charges and facility closures and $24 million in other charges.