Segment Information Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Segment Reporting Information [Line Items]
Net Operating Revenues	$ 1,406	$ 1,356	$ 1,402	$ 1,585	$ 2,012	$ 2,237	$ 2,390	$ 2,794	$ 5,749		$ 9,433		$ 14,911
Long-lived Assets	4,629				5,831				4,629		5,831
Operating Income (Loss)									(2,251)		(1,546)		505
Depreciation and Amortization									956		1,200		1,371
Capital Expenditures for Property, Plant and Equipment									(204)		(682)		(1,450)
Research and Development Expense									(159)		(231)		(290)
Long-Lived Asset Impairments, Write-Downs and Other Charges									1,043		768		495
Equity Investment Impairment											(25)
Severance and Restructuring Charges								$ (59)	(280)		(232)		(331)
Gain (Loss) on Disposition of Business									0		(6)		349
Total Assets	12,664				14,760				12,664		14,760
Inventory Write-down					217				252		186		113
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									5,749		9,433		14,911
Operating Income (Loss)									(410)		78		1,723
Depreciation and Amortization									940		1,176		1,348
Capital Expenditures for Property, Plant and Equipment									(189)		(663)		(1,388)
Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization									16		24		23
Capital Expenditures for Property, Plant and Equipment									(15)		(19)		(62)
Research and Development Expense									(298)		(425)		(468)
Total Assets	1,006				444				1,006		444
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Equity Investment Impairment											(25)		(161)
Severance and Restructuring Charges									(280)	[1]	(232)	[2]	(331)	[3]
Loss Contingency Accrual, Provision									220		116
Loss Contingency Accrual, Provision									(1,043)	[4]	768	[5]	495
Gain (Loss) on Disposition of Business											(6)		349
Other Nonoperating Expense											52	[6]	112	[7]
Core Regional Segments [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									5,329		8,720		13,669
Operating Income (Loss)									(323)		91		1,826
Depreciation and Amortization									851		1,066		1,169
Capital Expenditures for Property, Plant and Equipment									(110)		(595)		(1,230)
Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Equity Investment Impairment													40
Drilling Rigs [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									420		713		1,242
Operating Income (Loss)									(87)		(13)	[8]	(103)
Depreciation and Amortization									89		110		179
Capital Expenditures for Property, Plant and Equipment									(79)		(68)		(158)
Total Assets	1,419				1,516				1,419		1,516
North America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									1,878		3,494		6,852
Operating Income (Loss)									(382)		(308)	[8]	1,005
Depreciation and Amortization									208		362		430
Capital Expenditures for Property, Plant and Equipment									(35)		(161)		(454)
Total Assets	3,921				5,100				3,921		5,100
Middle East/North Africa/Asia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									1,453		1,947		2,406
Operating Income (Loss)									5		(28)	[8]	115
Depreciation and Amortization									233		254		280
Capital Expenditures for Property, Plant and Equipment									(21)		(75)		(183)
Total Assets	2,131				2,536				2,131		2,536
Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									939		1,613		2,584
Long-lived Assets	629				862				629		862
Europe/Sub-Sahara Africa/Russia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									939		1,533		2,129
Operating Income (Loss)									(11)		173	[8]	367
Depreciation and Amortization									182		201		218
Capital Expenditures for Property, Plant and Equipment									(34)		(132)		(282)
Total Assets	2,036				2,480				2,036		2,480
Latin America [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									1,064		1,782		2,381
Long-lived Assets	903				1,143				903		1,143
Latin America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues									1,059		1,746		2,282
Operating Income (Loss)									65		254	[8]	339
Depreciation and Amortization									228		249		241
Capital Expenditures for Property, Plant and Equipment									(20)		(227)		$ (311)
Total Assets	$ 2,151				$ 2,684				$ 2,151		$ 2,684

[1] Includes restructuring charges of $280 million: $96 million in North America, $56 million in Latin America, $36 million in Europe/SSA/Russia, $33 million in MENA/Asia Pacific, $52 million in Corporate and Research and Development and $7 million in Land Drilling Rigs.

[2] Includes restructuring charges of $232 million: $52 million in North America, $56 million in MENA/Asia Pacific, $56 million in Europe/SSA/Russia, $40 million in Latin America, $12 million in Land Drilling Rigs and $16 million in Corporate and Research and Development.

[3] Includes restructuring charges of $331 million: $76 million in North America, $133 million in MENA/Asia Pacific, $35 million in Europe/SSA/Russia, $48 million in Latin America, $9 million in Land Drilling Rigs and $30 million in Corporate and Research and Development.

[4] Includes $710 million related to long-lived asset impairments, asset write-downs, receivable write-offs and other charges and credits, $219 million in inventory write-downs and $114 million of pressure pumping related charges.

[5] Includes $638 million of long-lived asset impairment charges, supply agreement charges related to a non-core business divestiture of $67 million, and pressure pumping related charges of $63 million.

[6] Includes $17 million in professional and other fees, $11 million in divestiture related charges and facility closures and $24 million in other charges.

[7] 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.

[8] Includes inventory write-downs of $223 million attributable to the reporting segments as follows: $73 million in North America, $54 million in Latin America, $38 million in MENA/Asia Pacific, $32 million in Europe/SSA/Russia, and $26 million for Land Drilling Rigs. Also includes bad debt expense of $48 million of which $31 million was taken in the fourth quarter attributable to our reporting segments as follows: $20 million in North America, $12 million for Europe/SSA/Russia, $9 million in Latin America, and $7 million in MENA/Asia Pacific.