Segment Information (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended				12 Months Ended
	Sep. 30, 2017		Jun. 30, 2017	Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Operating Revenues	$ (1,460)			$ (1,356)		$ (4,209)		$ (4,343)
Operating Income (Loss)	(64)			(945)		(387)		(1,852)
Depreciation and Amortization	199			242		611		741
Corporate and Research and Development	(42)			(33)		(117)		(119)
Restructuring Charges	(34)			(22)		(140)		(150)
Overstatement (reduction) of revenues	(1,460)			(1,356)		(4,209)		(4,343)
Litigation Charges, Net	4			(9)		4		(190)
Revenue recognition adjustment
Segment Reporting Information [Line Items]
Net Operating Revenues										$ 23
Accounting change adjustment			$ 31
Overstatement (reduction) of revenues										$ 23
Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(1,460)			(1,356)		(4,209)		(4,343)
Operating Income (Loss)	34			(111)		(57)		(334)
Depreciation and Amortization	196			238		602		729
Overstatement (reduction) of revenues	(1,460)			(1,356)		(4,209)		(4,343)
Operating Segments | Core Regional Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(1,354)			(1,258)		(3,913)		(4,017)
Operating Income (Loss)	50			(92)		9		(272)
Depreciation and Amortization	173			216		532		662
Overstatement (reduction) of revenues	(1,354)			(1,258)		(3,913)		(4,017)
Operating Segments | Drilling Rigs
Segment Reporting Information [Line Items]
Net Operating Revenues	(106)			(98)		(296)		(326)
Operating Income (Loss)	(16)			(19)		(66)		(62)
Depreciation and Amortization	23			22		70		67
Overstatement (reduction) of revenues	(106)			(98)		(296)		(326)
Corporate and Research and Development
Segment Reporting Information [Line Items]
Depreciation and Amortization	3			4		9		12
Corporate and Research and Development	(70)			(63)		(211)		(226)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Restructuring Charges	(34)	[1]		(22)	[2]	(140)	[3]	(150)	[4]
Impairment of Long-Lived Assets and Other Related Charges	2			(740)	[5]	17		(952)	[6]
Litigation Charges, Net				(9)		4		(190)
North America | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(538)			(449)		(1,503)		(1,393)
Operating Income (Loss)	33			(95)		17		(324)
Depreciation and Amortization	39			55		119		167
Overstatement (reduction) of revenues	(538)			(449)		(1,503)		(1,393)
MENA/ Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(335)			(329)		(996)		(1,090)
Operating Income (Loss)	8			(8)		14		(4)
Depreciation and Amortization	49			60		151		181
Overstatement (reduction) of revenues	(335)			(329)		(996)		(1,090)
Europe/ SSA/ Russia | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(252)			(225)		(740)		(725)
Operating Income (Loss)	14			(3)		9		(3)
Depreciation and Amortization	36			45		114		141
Overstatement (reduction) of revenues	(252)			(225)		(740)		(725)
Latin America | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(229)			(255)		(674)	[7]	(809)
Operating Income (Loss)	(5)			14		(31)		59
Depreciation and Amortization	49			56		148		173
Overstatement (reduction) of revenues	(229)			(255)		(674)	[7]	(809)
2016 Plan
Segment Reporting Information [Line Items]
Restructuring Charges	(34)			(22)		(140)		(150)
2016 Plan | Core Regional Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(32)			(20)		(109)		(131)
2016 Plan | Drilling Rigs
Segment Reporting Information [Line Items]
Restructuring Charges	0			0		(2)		(5)
2016 Plan | Corporate and Research and Development
Segment Reporting Information [Line Items]
Restructuring Charges	(2)			(2)		(29)		(14)
2016 Plan | North America | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(1)			(5)		(24)		(44)
2016 Plan | MENA/ Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(20)			(5)		(29)		(25)
2016 Plan | Europe/ SSA/ Russia | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(2)			0		(31)		(25)
2016 Plan | Latin America | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	$ (9)			$ (10)		$ (25)		$ (37)

[1] Includes restructuring charges of $34 million: $20 million in MENA/Asia Pacific, $9 million in Latin America, $2 million in Europe/SSA/Russia, $2 million in Corporate and Research and Development, and $1 million in North America.

[2] Includes restructuring charges of $22 million: $10 million in Latin America, $5 million in North America, $5 million in MENA/Asia Pacific, and $2 million in Corporate and Research and Development.

[3] Includes restructuring charges of $140 million: $31 million in Europe/SSA/Russia, $29 million in MENA/Asia Pacific, $29 million in Corporate and Research and Development, $25 million in Latin America, $24 million in North America, and $2 million in Land Drilling Rigs.

[4] Includes restructuring charges of $150 million: $44 million in North America, $37 million in Latin America, $25 million in Europe/SSA/Russia, $25 million in MENA/Asia Pacific, $14 million in Corporate and Research and Development and $5 million in Land Drilling Rigs.

[5] Includes $436 million in long-lived asset impairments, $198 million in inventory write-downs, $62 million in accounts receivable reserves and write-offs, and $44 million of other asset write-offs and charges.

[6] Includes $436 million in long-lived asset impairments, $213 million in inventory write-downs, $121 million in other asset write-offs and charges, $84 million to adjust a note from our largest customer in Venezuela to fair value, $62 million in accounts receivable reserves and write-offs, $20 million in pressure pumping related charges, and $15 million in supply agreement charges related to a non-core business divestiture.

[7] In the second quarter of 2017, the Company changed its accounting for revenue with our largest customer in Venezuela. The total impact of this change for the first six months of 2017 related to prior periods is a reduction in revenues and income from operations of approximately $23 million for the second half of 2016.