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Business Segment and Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue: |  |  |  |  |
Revenue |  | $ 5,550 | $ 6,172 | $ 17,217 | $ 18,059
Operating income (loss): |  |  |  |  |
Impairments and other charges | [1] | 0 | 0 | (308) | (265)
Operating income |  | 536 | 716 | 1,204 | 1,859
Interest expense, net of interest income |  | (141) | (140) | (428) | (417)
Other, net |  | (23) | (42) | (61) | (86)
Income (loss) from continuing operations before income taxes |  | 372 | 534 | 715 | 1,356
Completion and Production |  |  |  |  |
Revenue: |  |  |  |  |
Revenue |  | 3,506 | 4,170 | 10,973 | 12,141
Operating income (loss): |  |  |  |  |
Impairments and other charges | [1] |  |  | (127) |
Operating income |  | 446 | 613 | 1,284 | 1,782
Drilling and Evaluation |  |  |  |  |
Revenue: |  |  |  |  |
Revenue |  | 2,044 | 2,002 | 6,244 | 5,918
Operating income (loss): |  |  |  |  |
Impairments and other charges | [1] |  |  | (153) |
Operating income |  | 150 | 181 | 418 | 560
Total operations |  |  |  |  |
Revenue: |  |  |  |  |
Revenue |  | 5,550 | 6,172 | 17,217 | 18,059
Operating income (loss): |  |  |  |  |
Operating income |  | 596 | 794 | 1,702 | 2,342
Corporate and other |  |  |  |  |
Operating income (loss): |  |  |  |  |
Operating income | [2] | $ (60) | $ (78) | (190) | $ (218)
Corporate and other |  |  |  |  |
Operating income (loss): |  |  |  |  |
Impairments and other charges | [1] |  |  | $ (28) |
[1] | For the nine months ended September 30, 2019, amount includes $127 million attributable to Completion and Production, $153 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. During the nine months ended September 30, 2018, we recognized a pre-tax charge of $265 million related to a write-down of all of our remaining investment in Venezuela. See Note 2 for further discussion on these impairments and other charges. There were no such impairments and other charges recorded during the three months ended September 30, 2019 or 2018.
[2] | Corporate and other includes certain expenses not attributable to a particular business segment, such as costs related to support functions and corporate executives.

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