Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Operating Revenues	$ 3,727	$ 3,877	$ 3,711	$ 3,596	$ 3,738	$ 3,820	$ 3,868	$ 3,837	$ 14,911		$ 15,263		$ 15,215
Operating Income (Loss)									505		523	[1]	298
Depreciation and Amortization									1,371		1,402		1,282
Capital Expenditures									1,450		1,575		2,177
Total Assets	18,889				21,977				18,889		21,977
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									14,911		15,263		15,215
Operating Income (Loss)									1,723		1,318		1,822
Depreciation and Amortization									1,348		1,382		1,257
Capital Expenditures									1,388		1,512		2,126
Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									6,852		6,390		6,824
Operating Income (Loss)									996		820	[2]	1,078	[3]
Depreciation and Amortization									431		424		412
Capital Expenditures									454		434		744
Total Assets	7,297				7,720				7,297		7,720
Operating Segments [Member] | Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									3,095		3,344		2,795
Operating Income (Loss)									85		(96)	[2]	34	[3]
Depreciation and Amortization									401		396		352
Capital Expenditures									319		526		657
Total Assets	4,736				5,328				4,736		5,328
Operating Segments [Member] | Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									2,584		2,693		2,519
Operating Income (Loss)									386		288	[2]	315	[3]
Depreciation and Amortization									259		286		255
Capital Expenditures									303		305		341
Total Assets	3,203				4,346				3,203		4,346
Operating Segments [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									2,380		2,836		3,077
Operating Income (Loss)									256		306	[2],[4]	395	[3]
Depreciation and Amortization									257		276		238
Capital Expenditures									312		247		384
Total Assets	3,307				4,247				3,307		4,247
Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									(468)		(466)		(453)
Depreciation and Amortization									23		20		25
Capital Expenditures									62		63		51
Total Assets	346				336				346		336
Impairment of Long-lived Assets, net of tax [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									(495)
Goodwill Impairment including assets held for sale [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									(161)				(793)
Restructuring Charges [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									(331)	[5]
U.S. Government Investigation Loss [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)											(153)		(100)
Gain on Sale of Business [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									349		24		28
Other Items [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									$ (112)	[6]	$ (200)	[7]	$ (206)	[1]

[1] Includes income tax restatement and material weakness remediation expenses of $103 million, $13 million of costs incurred in connection with U.S. government investigations, $11 million of non-recurring fees and expenses associated with our 2012 debt consent solicitation and severance, exit and other charges of $79 million.

[2] We recognized a charge for bad debt expense of $98 million attributable to our reporting segments as follows: $59 million in Latin America, $27 million in MENA/Asia Pacific, $10 million for Europe/SSA/Russia, and $2 million in North America. See footnote (d) below for additional details for the bad debt expense charge in Latin America of $59 million. During 2013, we recognized a charge for excess and obsolete inventory of $62 million attributable to each reporting segment as follows: $35 million in North America, $7 million in MENA/Asia Pacific, $13 million in Europe/SSA/Russia and $7 million in Latin America.

[3] We recognized a charge for excess and obsolete inventory of $53 million attributable to each reporting segment as follows: $21 million in North America, $16 million in MENA/Asia Pacific, $11 million in Europe/SSA/Russia and $5 million in Latin America. We also recognized a charge of $30 million to adjust the carrying value of our guar inventory, a component of certain drilling fluids, to the lower of cost or market, all of which was attributable to the North America reporting segment.

[4] On December 17, 2013, we accepted bonds with a face value of $127 million from PDVSA in full settlement of $127 million in trade receivables. Upon receipt, we immediately sold these bonds in a series of transactions recognizing a loss of $58 million.

[5] We recognized 2014 Plan restructuring charges of $273 million: $42 million in North America, $133 million in MENA/Asia Pacific, $31 million in Europe/SSA/Russia, $37 million in Latin America and $30 million in Corporate and Research and Development. We also recognized $58 million restructuring charges for our 2015 Plan: $32 million in North America, $8 million in MENA/Asia Pacific, $5 million in Europe/SSA/Russia, $12 million in Latin America and $1 million in Corporate and Research and Development.

[6] Includes professional fees of $107 million related to the divestiture of our non-core businesses, restatement related litigation, the settlement of the U.S. government investigations, and our 2014 redomestication from Switzerland to Ireland and other charges of $5 million.

[7] Includes $67 million of professional fees and expenses for U.S. government investigations and the remediation of our material weakness related to income taxes, $94 million of severance and $39 million of other items.