Segment Information (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014
Segment Reporting Information [Line Items]
Net Operating Revenues	$ 2,237		$ 3,877		$ 7,421		$ 11,184
Income from Operations	(98)		318		(512)		473
Depreciation and Amortization	298		327		925		1,033
Long-Lived Assets Impairment	(17)		0		(208)		(143)
Corporate and Research and Development	(56)		(72)		(179)		(216)
Restructuring Charges	(49)		(154)		(159)		(283)
Litigation Charges	0		0		(112)		0
Gain on Sale of Businesses	0		38		(2)		38
Goodwill, Impairment Loss	0		4		(20)		(121)
Professional Fees	7				18
Facility Closure Fees	2				5
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues	2,237		3,877		7,421		11,184
Income from Operations	80		575		345		1,407
Depreciation and Amortization	292		321		907		1,016
Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues	824		1,814		2,795		5,083
Income from Operations	(54)		288		(156)		728
Depreciation and Amortization	87		108		289		322
Operating Segments [Member] | MENA/ Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues	445		633		1,494		1,831
Income from Operations	2		66		45		132
Depreciation and Amortization	62		67		193		210
Operating Segments [Member] | Europe/ SSA/ Russia [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues	361		555		1,196		1,632
Income from Operations	43		118		179		301
Depreciation and Amortization	52		52		155		163
Operating Segments [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues	421		591		1,370		1,618
Income from Operations	73		96		247		262
Depreciation and Amortization	63		57		186		176
Operating Segments [Member] | Core Regional Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues	2,051		3,593		6,855		10,164
Income from Operations	64		568		315		1,423
Depreciation and Amortization	264		284		823		871
Operating Segments [Member] | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues	186		284		566		1,020
Income from Operations	16		7		30		(16)
Depreciation and Amortization	28		37		84		145
Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	6		6		18		17
Corporate and Research and Development	(101)		(117)		(326)		(353)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets Impairment							(143)
Restructuring Charges	(49)	[1]	(154)	[2]	(159)	[3]	(283)	[4]
Litigation Charges					(112)
Gain on Sale of Businesses			38		(2)		38
Other Items	(11)	[5]	(28)	[6]	(30)	[7]	(72)	[8]
Long-Lived Assets Impairment and Other Related Charges (a)	$ (17)	[9]			(208)	[10]
Goodwill, Impairment Loss			$ 4		$ (20)		$ (121)

[1] For the three months ended September 30, 2015, we recognized restructuring charges of $49 million: $9 million in North America, $5 million in MENA/Asia Pacific, $11 million in Europe/SSA/Russia, $10 million in Latin America, $6 million in Land Drilling Rigs and $8 million in Corporate and Research and Development.

[2] For the three months ended September 30, 2014, we recognized restructuring charges of $154 million: $16 million in North America, $111 million in MENA/Asia Pacific, $9 million in Europe/SSA/Russia, $13 million in Latin America and $5 million in Land Drilling Rigs.

[3] For the nine months ended September 30, 2015, we recognized restructuring charges of $159 million: $38 million in North America, $40 million in MENA/Asia Pacific, $32 million in Europe/SSA/Russia, $26 million in Latin America, $12 million in Land Drilling Rigs and $11 million in Corporate and Research and Development.

[4] For the nine months ended September 30, 2014, we recognized restructuring charges of $283 million: $44 million in North America, $128 million in MENA/Asia Pacific, $36 million in Europe/SSA/Russia, $36 million in Latin America, $9 million in Land Drilling Rigs and $30 million in Corporate and Research and Development.

[5] The three months ended September 30, 2015 includes professional and other fees of $7 million, facility closure fees of $2 million, and divestiture related charges of $2 million.

[6] The three months ended September 30, 2014 includes professional fees related to the divestiture of our non-core businesses, restatement related litigation, the settlement of the U.S. government investigations and other charges.

[7] The nine months ended September 30, 2015 includes professional and other fees of $18 million, facility closure fees of $5 million, and divestiture related charges of $7 million.

[8] The nine months ended September 30, 2014 includes professional fees of $64 million related to the divestiture of our non-core businesses, restatement related litigation, the settlement of the U.S. government investigations, the remediation of our material weakness related to income taxes and our 2014 redomestication from Switzerland to Ireland and other charges of $8 million.

[9] For the three months ended September 30, 2015 includes pressure pumping business related charges of $15 million and supply agreement charges related to a non-core business divestiture of $2 million.

[10] The nine months ended September 30, 2015 includes asset impairment charges of $124 million, pressure pumping business related charges of $52 million and supply agreement charges related to a non-core business divestiture of $32 million.