Segment Information (Narrative) (Details) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)	Mar. 31, 2015 unit	Sep. 30, 2014 USD ($)		Sep. 30, 2015 USD ($)		Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | unit				5
Pressure Pumping Related Charges	$ 15						$ 52
Long-Lived Assets Impairment			$ 124				124		$ 143
Supply Agreement Charges related to Non-Core Business Divestiture	2						32
Severance, asset impairment and other restructuring charges	49				$ 154		159		283
Professional Fees	7						18
Facility Closure Fees	2						5
Divestiture, professional and other fees portion									64
Other nonrecurring (income) expense	2						7		8
Liability related to contractual residual guarantees	80						80
Minimum purchase commitment liability	78						78
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	49	[1]			154	[2]	159	[3]	283	[4]
2015 Plan
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	49						159
2015 Plan | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	6						12
2015 Plan | Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	9						38
2015 Plan | Operating Segments [Member] | MENA/ Asia Pacific [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	5						40
2015 Plan | Operating Segments [Member] | Europe/ SSA/ Russia [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	11						32
2015 Plan | Operating Segments [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	10						26
2015 Plan | Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	8						11
2015 Plan | Employee Severance [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	40						99
2015 Plan | Employee Severance [Member] | North America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	4						16
2015 Plan | Employee Severance [Member] | MENA/ Asia Pacific [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	3						14
2015 Plan | Employee Severance [Member] | Europe/ SSA/ Russia [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	9						21
2015 Plan | Employee Severance [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	10						25
2015 Plan | Employee Severance [Member] | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	6						12
2015 Plan | Employee Severance [Member] | Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges	8						11
2014 Plan [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					154				283
2014 Plan [Member] | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					5				9
2014 Plan [Member] | Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					16				44
2014 Plan [Member] | Operating Segments [Member] | MENA/ Asia Pacific [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					111				128
2014 Plan [Member] | Operating Segments [Member] | Europe/ SSA/ Russia [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					9				36
2014 Plan [Member] | Operating Segments [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					13				36
2014 Plan [Member] | Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					0				30
2014 Plan [Member] | Employee Severance [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					21				119
2014 Plan [Member] | Employee Severance [Member] | North America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					2				15
2014 Plan [Member] | Employee Severance [Member] | MENA/ Asia Pacific [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					10				20
2014 Plan [Member] | Employee Severance [Member] | Europe/ SSA/ Russia [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					1				22
2014 Plan [Member] | Employee Severance [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					7				29
2014 Plan [Member] | Employee Severance [Member] | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					1				5
2014 Plan [Member] | Employee Severance [Member] | Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Severance, asset impairment and other restructuring charges					$ 0				$ 28
Other Current Liabilities [Member]
Segment Reporting Information [Line Items]
Minimum purchase commitment liability	65						65
Other Noncurrent Liabilities [Member]
Segment Reporting Information [Line Items]
Minimum purchase commitment liability	$ 13						$ 13

[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.