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Business Segment and Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue: |  |  |  |  |  |
Revenue |  |  | $ 23,995 | $ 20,620 | $ 15,887 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  |  | 2,467 | 1,374 | (6,770) |
Impairments and other charges |  | $ 265 | 265 | 647 | 3,357 | [1]
Impairments and other charges | [1] |  | (265) | (647) | (3,357) |
Interest expense, net of interest income |  |  | (554) | (593) | (639) |
Other, net |  |  | (99) | (99) | (216) |
Income (loss) from continuing operations before income taxes |  |  | 1,814 | 682 | (7,625) |
Capital expenditures: |  |  |  |  |  |
Total capital expenditures |  |  | 2,026 | 1,373 | 798 |
Depreciation, depletion and amortization: |  |  |  |  |  |
Total depreciation, depletion and amortization |  |  | 1,606 | 1,556 | 1,503 |
Total assets: |  |  |  |  |  |
Total assets |  |  | 25,982 | 25,085 |  |
Property, Plant and Equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  | 8,961 | 8,521 |  |
Completion and Production |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Revenue |  |  | 15,973 | 13,077 | 8,882 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  |  | 2,278 | 1,625 | 108 |
Impairments and other charges |  |  |  |  | 2,100 |
Capital expenditures: |  |  |  |  |  |
Total capital expenditures |  |  | 1,364 | 1,111 | 500 |
Depreciation, depletion and amortization: |  |  |  |  |  |
Total depreciation, depletion and amortization |  |  | 1,058 | 953 | 900 |
Total assets: |  |  |  |  |  |
Total assets | [2] |  | 13,231 | 12,276 |  |
Drilling and Evaluation |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Revenue |  |  | 8,022 | 7,543 | 7,005 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  |  | 745 | 726 | 801 |
Impairments and other charges |  |  |  |  | 1,200 |
Capital expenditures: |  |  |  |  |  |
Total capital expenditures |  |  | 657 | 261 | 297 |
Depreciation, depletion and amortization: |  |  |  |  |  |
Total depreciation, depletion and amortization |  |  | 512 | 563 | 569 |
Total assets: |  |  |  |  |  |
Total assets | [2] |  | 8,037 | 7,837 |  |
Corporate and shared assets |  |  |  |  |  |
Total assets: |  |  |  |  |  |
Total assets | [3] |  | 4,714 | 4,972 |  |
Total operations |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  |  | 3,023 | 2,351 | 909 |
Corporate and other |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) | [4] |  | (291) | (330) | (4,322) |
Impairments and other charges |  |  |  |  | 10 |
Capital expenditures: |  |  |  |  |  |
Total capital expenditures |  |  | 5 | 1 | 1 |
Depreciation, depletion and amortization: |  |  |  |  |  |
Total depreciation, depletion and amortization |  |  | 36 | 40 | 34 |
VENEZUELA |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |
Impairments and other charges | [1] |  |  | (647) |  |
North America [Member] |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Revenue |  |  | 14,431 | 11,564 | 6,770 |
Property, Plant and Equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  | 5,672 | 4,922 |  |
Latin America [Member] |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Revenue |  |  | 2,065 | 2,116 | 1,860 |
Property, Plant and Equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  | 974 | 945 |  |
Europe/Africa/CIS [Member] |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Revenue |  |  | 2,945 | 2,781 | 2,993 |
Property, Plant and Equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  | 938 | 1,098 |  |
Middle East/Asia [Member] |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Revenue |  |  | 4,554 | 4,159 | $ 4,264 |
Property, Plant and Equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  | $ 1,377 | $ 1,556 |  |
[1] | Impairments and other charges are as follows: -For the year ended December 31, 2018, the aggregate charge of $265 million represents a write-down of all of our remaining investment in Venezuela, consisting of receivables, fixed assets, inventory and other assets and liabilities. -For the year ended December 31, 2017, the aggregate charge of $647 million represents a fair market value adjustment on our existing promissory note with our primary customer in Venezuela and a full reserve against our other accounts receivable with this customer. -For the year ended December 31, 2016, the aggregate charge of $3.4 billion consisted of fixed asset impairments and write-offs, inventory write-downs, impairments of intangible assets, severance costs, country and facility closures, and other charges related to the energy downturn. This included $2.1 billion attributable to Completion and Production, $1.2 billion attributable to Drilling and Evaluation and $10 million attributable to Corporate and other.
[2] | Assets associated with specific segments primarily include receivables, inventories, certain identified property, plant and equipment (including field service equipment), equity in and advances to related companies and goodwill.
[3] | Corporate and other shared assets primarily include cash and equivalents and deferred tax assets.
[4] | Includes certain expenses not attributable to a particular business segment, such as costs related to support functions and corporate executives, and also includes amortization expense associated with intangible assets recorded as a result of acquisitions. Also includes merger-related costs and a termination fee during the year ended December 31, 2016.

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