Segment Information (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2017		Mar. 31, 2017	Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Segment Reporting Information [Line Items]
Net Operating Revenues	$ (1,363)			$ (1,402)		$ (2,749)		$ (2,987)
Operating Income (Loss)	(127)			(460)		(323)		(907)
Depreciation and Amortization	204			249		412		499
Corporate and Research and Development	(36)			(41)		(75)		(86)
Restructuring Charges	(31)			(51)		(106)		(128)
Overstatement (reduction) of revenues	(1,363)			(1,402)		(2,749)		(2,987)
Litigation Charges, Net	0			(114)		0		(181)
Revenue recognition adjustment
Segment Reporting Information [Line Items]
Net Operating Revenues								23
Accounting change adjustment	31		$ 8					23
Overstatement (reduction) of revenues								23
Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(1,363)			(1,402)		(2,749)		(2,987)
Operating Income (Loss)	(39)			(66)		(91)		(223)
Depreciation and Amortization	201			245		406		491
Overstatement (reduction) of revenues	(1,363)			(1,402)		(2,749)		(2,987)
Operating Segments | Core Regional Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(1,262)			(1,293)		(2,559)		(2,759)
Operating Income (Loss)	(19)			(49)		(41)		(180)
Depreciation and Amortization	178			222		359		446
Overstatement (reduction) of revenues	(1,262)			(1,293)		(2,559)		(2,759)
Operating Segments | Drilling Rigs
Segment Reporting Information [Line Items]
Net Operating Revenues	(101)			(109)		(190)		(228)
Operating Income (Loss)	(20)			(17)		(50)		(43)
Depreciation and Amortization	23			23		47		45
Overstatement (reduction) of revenues	(101)			(109)		(190)		(228)
Corporate and Research and Development
Segment Reporting Information [Line Items]
Depreciation and Amortization	3			4		6		8
Corporate and Research and Development	(69)			(75)		(141)		(163)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Restructuring Charges	(31)	[1]		(51)	[2]	(106)	[3]	(128)	[4]
Impairment of Long-Lived Assets and Other Related Charges	12			(154)	[5]	15		(212)	[6]
Litigation Charges, Net				(114)				(181)
North America | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(475)			(401)		(965)		(944)
Operating Income (Loss)	2			(101)		(16)		(229)
Depreciation and Amortization	40			58		80		112
Overstatement (reduction) of revenues	(475)			(401)		(965)		(944)
MENA/ Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(340)			(400)		(661)		(761)
Operating Income (Loss)	9			50		6		4
Depreciation and Amortization	51			60		102		121
Overstatement (reduction) of revenues	(340)			(400)		(661)		(761)
Europe/ SSA/ Russia | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(244)			(243)		(488)		(500)
Operating Income (Loss)	5			1		(5)		0
Depreciation and Amortization	39			48		78		96
Overstatement (reduction) of revenues	(244)			(243)		(488)		(500)
Latin America | Operating Segments
Segment Reporting Information [Line Items]
Net Operating Revenues	(203)	[7]		(249)		(445)	[8]	(554)
Operating Income (Loss)	(35)			1		(26)		45
Depreciation and Amortization	48			56		99		117
Overstatement (reduction) of revenues	(203)	[7]		(249)		(445)	[8]	(554)
2016 Plan
Segment Reporting Information [Line Items]
Restructuring Charges	(31)			(51)		(106)		(128)
2016 Plan | Core Regional Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(29)			(48)		(77)		(111)
2016 Plan | Drilling Rigs
Segment Reporting Information [Line Items]
Restructuring Charges	(1)			(1)		(2)		(5)
2016 Plan | Corporate and Research and Development
Segment Reporting Information [Line Items]
Restructuring Charges	(1)			(2)		(27)		(12)
2016 Plan | North America | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(8)			(15)		(23)		(39)
2016 Plan | MENA/ Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(5)			(11)		(9)		(20)
2016 Plan | Europe/ SSA/ Russia | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	(8)			(10)		(29)		(25)
2016 Plan | Latin America | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Charges	$ (8)			$ (12)		$ (16)		$ (27)

[1] Includes restructuring charges of $31 million: $8 million in Europe/SSA/Russia, $8 million in Latin America, $8 million in North America, $5 million in MENA/Asia Pacific, $1 million in Corporate and Research and Development, and $1 million in Land Drilling Rigs.

[2] Includes restructuring charges of $51 million: $15 million in North America, $10 million in Europe/SSA/Russia, $12 million in Latin America, $11 million in MENA/Asia Pacific, $2 million in Corporate and Research and Development, and $1 million in Land Drilling Rigs.

[3] Includes restructuring charges of $106 million: $29 million in Europe/SSA/Russia, $27 million in Corporate and Research and Development, $23 million in North America, $16 million in Latin America, $9 million in MENA/Asia Pacific, and $2 million in Land Drilling Rigs.

[4] Includes restructuring charges of $128 million: $39 million in North America, $27 million in Latin America, $25 million in Europe/SSA/Russia, $20 million in MENA/Asia Pacific, $12 million in Corporate and Research and Development and $5 million in Land Drilling Rigs.

[5] Includes $84 million to adjust a note from our largest customer in Venezuela to fair value and other impairments and write-offs of $70 million.

[6] Includes $84 million to adjust a note from our largest customer in Venezuela to fair value, $92 million related to impairments, write-offs and other charges and $35 million of pressure pumping related charges.

[7] As discussed in “Note 1 – General”, in the second quarter of 2017, the Company changed its accounting for revenue related to an implied financing arrangement with our largest customer in Venezuela. The total impact of this change in the second quarter of 2017 related to prior periods is a reduction in revenues and income from operations of approximately $31 million: $8 million for the first quarter of 2017 and $23 million for the second half of 2016.

[8] As discussed in “Note 1 – General”, in the second quarter of 2017, the Company changed its accounting for revenue related to an implied financing arrangement 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.