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Business Segments - Other Items by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Total other items | $ 1,078 | $ 112 | $ 1,336 | $ 251
Operating Segments [Member] | Rig Systems [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 994 | 22 | 1,069 | 65
Operating Segments [Member] | Rig Aftermarket [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 3 | 1 | 16 | 11
Operating Segments [Member] | Wellbore Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 24 | 29 | 112 | 83
Operating Segments [Member] | Completion & Production Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 51 | $ 60 | 123 | $ 92
Eliminations and Corporate Costs [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | $ 6 |  | $ 16 |

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