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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Long-Lived Asset Impairments and Other Charges $ 436   $ 436 $ 124  
Production Related Impairments or Charges 198   213    
Allowance for Doubtful Accounts Receivable, Write-offs 62   62    
Professional fees and other asset write-offs 44        
Severance, asset impairment and other restructuring charges 22 $ 49 150 159  
Pressure Pumping Related Charges   15 20 52  
Supply Agreement Charges related to Non-Core Business Divestiture   2 15 32  
Professional Fees   7   18  
Other Expenses       7  
Other Nonrecurring (Income) Expense   2 121    
Financing Receivable, Allowance for Credit Losses, Write-downs     84    
Facility Closure Fees       5  
Revenues 1,356 2,237 4,343 7,421  
Operating Income (Loss) (945) (98) (1,852) (512)  
Depreciation and Amortization 242 298 741 925  
Research and Development 33 56 119 179  
Litigation Charges, Net 9 0 190 112  
Gain (Loss) on Disposition of Business 0 0 (1) (2)  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 1,356 2,237 4,343 7,421  
Operating Income (Loss) (111) 80 (334) 345  
Depreciation and Amortization 238 292 729 907  
Operating Segments [Member] | Core Regional Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 1,258 2,051 4,017 6,855  
Operating Income (Loss) (92) 64 (272) 315  
Depreciation and Amortization 216 264 662 823  
Operating Segments [Member] | Drilling Rigs [Member]          
Segment Reporting Information [Line Items]          
Revenues 98 186 326 566  
Operating Income (Loss) (19) 16 (62) 30  
Depreciation and Amortization 22 28 67 84  
Corporate and Research and Development [Member]          
Segment Reporting Information [Line Items]          
Depreciation and Amortization 4 6 12 18  
Research and Development 63 101 226 326  
Segment Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges [1] 22 49 150 159  
Impairment of Long-Lived Assets and Other Related Charges 740 [2] (17)   951 [2] $ (208)
Goodwill, Impairment Loss       (20)  
Litigation Charges, Net 9   190 (112)  
Gain (Loss) on Disposition of Business     (1) (2)  
Other Nonoperating Expense [3]   11   30  
Latin America [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 255 421 809 1,370  
Operating Income (Loss) 14 73 59 247  
Depreciation and Amortization 56 63 173 186  
Europe, Sub-Sahara Africa, Russia [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 225 361 725 1,196  
Operating Income (Loss) (3) 43 (3) 179  
Depreciation and Amortization 45 52 141 155  
Middle East, North Africa, and Asia [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 329 445 1,090 1,494  
Operating Income (Loss) (8) 2 (4) 45  
Depreciation and Amortization 60 62 181 193  
North America [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenues 449 824 1,393 2,795  
Operating Income (Loss) (95) (54) (324) (156)  
Depreciation and Amortization 55 87 167 289  
2015 Plan [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   49   159  
2015 Plan [Member] | Core Regional Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   35   136  
2015 Plan [Member] | Drilling Rigs [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   6   12  
2015 Plan [Member] | Corporate and Research and Development [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   8   11  
2015 Plan [Member] | Latin America [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   10   26  
2015 Plan [Member] | Europe, Sub-Sahara Africa, Russia [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   11   32  
2015 Plan [Member] | Middle East, North Africa, and Asia [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   5   40  
2015 Plan [Member] | North America [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges   $ 9   $ 38  
2016 Plan [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges 22   150    
2016 Plan [Member] | Core Regional Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges 20   131    
2016 Plan [Member] | Drilling Rigs [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges 0   5    
2016 Plan [Member] | Corporate and Research and Development [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges 2   14    
2016 Plan [Member] | Latin America [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges 10   37    
2016 Plan [Member] | Europe, Sub-Sahara Africa, Russia [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges 0   25    
2016 Plan [Member] | Middle East, North Africa, and Asia [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges 5   25    
2016 Plan [Member] | North America [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Severance, asset impairment and other restructuring charges $ 5   $ 44    
[1] Includes restructuring charges of $22 million: $10 million in Latin America, $5 million in North America, $5 million in MENA/Asia Pacific, and $2 million in Corporate and Research and Development.
[2] Includes $436 million in long-lived asset impairments, $198 million in inventory write-downs, $62 million in accounts receivable reserves and write-offs, and $44 million of other asset write-offs and charges.
[3] Includes professional and other fees of $7 million, facility closure fees of $2 million, and divestiture related charges of $2 million.