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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | $ 5,634 | $ 5,356 | $ 10,857 | $ 12,811
Income (Loss) Before Taxes |  | 542 | (3,627) | 928 | (11,716)
Pretax segment operating income |  | 807 | 396 | 1,471 | 1,172
Interest expense |  | 136 | 144 | 272 | 281
Digital Integration |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 817 | 619 | 1,590 | 1,503
Reservoir Performance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 1,117 | 1,170 | 2,119 | 3,139
Production Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 1,681 | 1,557 | 3,271 | 3,469
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 5,634 | 5,356 | 10,857 | 12,811
Interest income |  | 1 |  | 1 | 1
Interest expense |  | 4 | 7 | 8 | 15
Operating Segments | Digital Integration |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 817 | 619 | 1,590 | 1,503
Income (Loss) Before Taxes |  | 274 | 108 | 521 | 259
Operating Segments | Reservoir Performance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 1,117 | 1,170 | 2,119 | 3,139
Income (Loss) Before Taxes |  | 156 | 22 | 258 | 156
Operating Segments | Well Construction |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 2,110 | 2,089 | 4,045 | 4,904
Income (Loss) Before Taxes |  | 272 | 180 | 482 | 511
Operating Segments | Production Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 1,681 | 1,557 | 3,271 | 3,469
Income (Loss) Before Taxes |  | 171 | 145 | 309 | 336
Eliminations & other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | (91) | (79) | (168) | (204)
Income (Loss) Before Taxes |  | (66) | (59) | (99) | (90)
Corporate & other | [1] | (138) | (169) | (288) | (397)
Interest income | [2] | 5 | 7 | 9 | 22
Interest expense | [3] | $ (132) | (137) | $ (264) | (266)
Charges and credits | [4] |  | $ (3,724) |  | $ (12,247)
[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 2021; $- million in 2020).
[3] | Interest expense excludes amounts which are included in the segments’ income ($4 million in 2021; $7 million in 2020).
[4] | See Note 2 – Charges and Credits.

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