Segment Information Narrative (Details) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($) unit	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | unit						5
Long-Lived Asset Impairments and Other Charges							$ 352	$ 436	$ 638	$ 495
Production Related Impairments or Charges								219
Pressure Pumping Related Charges								114	63
Fair Value Adjustment of Warrants	$ 16
Supply Agreement Charges related to Non-Core Business Divestiture									67
Restructuring Charges						$ 59		280	232	331
Professional Fees									17	107
Facility Closure Fees									24
Other Nonrecurring (Income) Expense	245	$ 771	$ 347	$ 285					11	5
Bad Debt Expense					$ 31			69	48	27
Increase (decrease) in accounts receivable								(214)	(1,031)	(78)
Assets	12,664				14,760			12,664	14,760
Deferred tax assets for long-lived assets	81				207			81	207
Financing Receivable, Allowance for Credit Losses, Write-downs			$ 84					76
Allowance for Doubtful Accounts Receivable, Write-offs								62
North America [Member]
Segment Reporting Information [Line Items]
Production Related Impairments or Charges									73
Bad Debt Expense									20
UNITED STATES
Segment Reporting Information [Line Items]
Assets	3,300				4,400			3,300	4,400
North America, Excluding the United States [Member]
Segment Reporting Information [Line Items]
Assets	608				731			608	731
Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Production Related Impairments or Charges									32
Bad Debt Expense									12
Latin America [Member]
Segment Reporting Information [Line Items]
Production Related Impairments or Charges									54
Bad Debt Expense									9
Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Production Related Impairments or Charges									38
Bad Debt Expense									7
Severance and Other Restructuring Liabilities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										331
2016 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges								280
2014 Plan [Member] | Severance and Other Restructuring Liabilities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										273
2015 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									232
2015 Plan [Member] | Severance and Other Restructuring Liabilities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									58	58
2015 Plan [Member] | Employee Severance [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									58
Corporate and Research and Development [Member]
Segment Reporting Information [Line Items]
Assets	1,006				444			1,006	444
Corporate and Research and Development [Member] | 2016 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges								52
Corporate and Research and Development [Member] | 2014 Plan [Member] | Severance and Other Restructuring Liabilities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										29
Corporate and Research and Development [Member] | 2015 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									16
Corporate and Research and Development [Member] | 2015 Plan [Member] | Severance and Other Restructuring Liabilities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										1
Corporate and Research and Development [Member] | 2014 & 2015 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										30
Operating Segments [Member]
Segment Reporting Information [Line Items]
Production Related Impairments or Charges									223
Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	3,921				5,100			3,921	5,100
Operating Segments [Member] | Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Assets	2,036				2,480			2,036	2,480
Operating Segments [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Assets	2,151				2,684			2,151	2,684
Operating Segments [Member] | Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Assets	2,131				2,536			2,131	2,536
Operating Segments [Member] | 2016 Plan [Member] | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges								7
Operating Segments [Member] | 2016 Plan [Member] | North America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges								96
Operating Segments [Member] | 2016 Plan [Member] | Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges								36
Operating Segments [Member] | 2016 Plan [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges								56
Operating Segments [Member] | 2016 Plan [Member] | Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges								33
Operating Segments [Member] | 2014 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | North America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										44
Operating Segments [Member] | 2014 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										30
Operating Segments [Member] | 2014 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										36
Operating Segments [Member] | 2014 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										125
Operating Segments [Member] | 2015 Plan [Member] | North America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									52
Operating Segments [Member] | 2015 Plan [Member] | Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									56
Operating Segments [Member] | 2015 Plan [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									40
Operating Segments [Member] | 2015 Plan [Member] | Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									56
Operating Segments [Member] | 2015 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | North America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										32
Operating Segments [Member] | 2015 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										5
Operating Segments [Member] | 2015 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										12
Operating Segments [Member] | 2015 Plan [Member] | Severance and Other Restructuring Liabilities [Member] | Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										8
Operating Segments [Member] | 2014 & 2015 Plan [Member] | North America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										76
Operating Segments [Member] | 2014 & 2015 Plan [Member] | Europe/Sub-Sahara Africa/Russia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										35
Operating Segments [Member] | 2014 & 2015 Plan [Member] | Latin America [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										48
Operating Segments [Member] | 2014 & 2015 Plan [Member] | Middle East/North Africa/Asia [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										133
Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Long-Lived Asset Impairments and Other Charges									255
Production Related Impairments or Charges									26
Drilling Rigs [Member] | 2014 Plan [Member] | Severance and Other Restructuring Liabilities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										9
Drilling Rigs [Member] | 2015 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges									12
Drilling Rigs [Member] | 2015 Plan [Member] | Severance and Other Restructuring Liabilities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										0
Drilling Rigs [Member] | 2014 & 2015 Plan [Member]
Segment Reporting Information [Line Items]
Restructuring Charges										$ 9
Drilling Rigs [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets	$ 1,419				$ 1,516			1,419	$ 1,516
Assets, Total [Member]
Segment Reporting Information [Line Items]
Long-Lived Asset Impairments and Other Charges								$ 710