Segment Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015
Segment Reporting Information [Line Items]
Net Operating Revenues		$ 1,585		$ 2,794
Operating Income (Loss)		(447)		50
Depreciation and Amortization		250		316
Corporate and Research and Development		(45)		(64)
Restructuring Charges		(77)		(41)
Litigation Charges		(67)		0
Gain (Loss) on Disposition of Business		(1)		3
Professional Fees		6		13
Other Expenses	[1]			8
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues		1,585		2,794
Operating Income (Loss)		(157)		229
Depreciation and Amortization		246		310
Operating Segments [Member] | Core Regional Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues		1,466		2,599
Operating Income (Loss)		(131)		219
Depreciation and Amortization		224		281
Operating Segments [Member] | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues		119		195
Operating Income (Loss)		(26)		10
Depreciation and Amortization		22		29
Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization		4		6
Corporate and Research and Development		(88)		(120)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Impairment of Long-Lived Assets and Other Related Charges	[2]	49
Restructuring Charges		(77)	[3]	(41)	[4]
Litigation Charges	[1]	(67)
Gain (Loss) on Disposition of Business		(1)		3
Other Items		(8)	[1]	(21)	[5]
North America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues		543		1,163
Operating Income (Loss)		(128)		(10)
Depreciation and Amortization		54		105
MENA/ Asia Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues		361		533
Operating Income (Loss)		(46)		60
Depreciation and Amortization		61		65
Europe/ SSA/ Russia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues		257		417
Operating Income (Loss)		(1)		71
Depreciation and Amortization		48		50
Latin America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Operating Revenues		305		486
Operating Income (Loss)		44		98
Depreciation and Amortization		$ 61		61
2015 Plan
Segment Reporting Information [Line Items]
Restructuring Charges				(41)
2015 Plan | Core Regional Segments [Member]
Segment Reporting Information [Line Items]
Restructuring Charges				(33)
2015 Plan | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges				(5)
2015 Plan | Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Restructuring Charges				(3)
2015 Plan | North America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Restructuring Charges				(8)
2015 Plan | MENA/ Asia Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Restructuring Charges				(6)
2015 Plan | Europe/ SSA/ Russia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Restructuring Charges				(7)
2015 Plan | Latin America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Restructuring Charges				$ (12)

[1] Includes professional and other fees of $6 million and divestiture related charges of $2 million.

[2] Includes pressure pumping business related charges of $20 million, supply agreement charges related to a non-core business divestiture of $15 million and $14 million primarily related to a rig casualty loss.

[3] Includes restructuring charges of $77 million: $24 million in North America, $15 million in Europe/SSA/Russia, $15 million in Latin America, $10 million in Corporate and Research and Development, $9 million in MENA/Asia Pacific, and $4 million in Land Drilling Rigs.

[4] Includes restructuring charges of $41 million: $8 million in North America, $6 million in MENA/Asia Pacific, $7 million in Europe/SSA/Russia, $12 million in Latin America, $5 million in Land Drilling Rigs and $3 million in Corporate and Research and Development.

[5] Includes professional fees of $13 million related to the divestiture of our non-core businesses, restatement related litigation, post-settlement monitor and auditor expenses and other charges of $8 million.