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Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | $ 8,303 |  | $ 7,462 |  | $ 16,131 |  | $ 14,356 |
Income Before Taxes |  | 547 |  | 17 |  | 1,190 |  | 351 |
Pretax operating income |  | 1,094 |  | 950 |  | 2,068 |  | 1,707 |
Interest expense |  | 144 |  | 142 |  | 287 |  | 281 |
Reservoir Characterization |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 1,636 |  | 1,759 |  | 3,192 |  | 3,377 |
Drilling |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 2,234 |  | 2,107 |  | 4,360 |  | 4,092 |
Production |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 3,257 |  | 2,496 |  | 6,216 |  | 4,683 |
Cameron |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 1,295 |  | 1,265 |  | 2,605 |  | 2,494 |
Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 8,303 |  | 7,462 |  | 16,131 |  | 14,356 |
Interest income |  | 1 |  | 6 |  | 4 |  | 11 |
Interest expense |  | 9 |  | 14 |  | 21 |  | 27 |
Operating Segments | Reservoir Characterization |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 1,636 |  | 1,759 |  | 3,192 |  | 3,377 |
Income Before Taxes |  | 350 |  | 299 |  | 657 |  | 580 |
Operating Segments | Drilling |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 2,234 |  | 2,107 |  | 4,360 |  | 4,092 |
Income Before Taxes |  | 289 |  | 302 |  | 582 |  | 531 |
Operating Segments | Production |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 3,257 |  | 2,496 |  | 6,216 |  | 4,683 |
Income Before Taxes |  | 316 |  | 221 |  | 532 |  | 331 |
Operating Segments | Cameron |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 1,295 |  | 1,265 |  | 2,605 |  | 2,494 |
Income Before Taxes |  | 166 |  | 174 |  | 332 |  | 336 |
Eliminations & other |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | (119) |  | (165) |  | (242) |  | (290) |
Income Before Taxes |  | (27) |  | (46) |  | (35) |  | (71) |
Corporate & other | [1] | (239) |  | (242) |  | (464) |  | (480) |
Interest income |  | 11 | [2] | 28 | [2] | 36 | [3] | 52 | [3]
Interest expense |  | (135) | [4] | (128) | [4] | (266) | [5] | (254) | [5]
Charges and credits | [6] | $ (184) |  | $ (591) |  | $ (184) |  | $ (674) |
[1] | Comprised principally of certain corporate expenses not allocated to the segments, stock-based compensation costs, amortization expense associated with certain intangible assets, certain centrally managed initiatives and other nonoperating items.
[2] | Interest income excludes amounts which are included in the segments’ income ($1 million in 2018; $6 million in 2017).
[3] | Interest income excludes amounts which are included in the segments’ income ($4 million in 2018; $11 million in 2017).
[4] | Interest expense excludes amounts which are included in the segments’ income ($9 million in 2018; $14 million in 2017).
[5] | Interest expense excludes amounts which are included in the segments’ income ($21 million in 2018; $27 million in 2017).
[6] | See Note 2 – Charges and Credits.

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