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Business Segments - Other Items by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Total other items | $ 112 | $ 1 | $ 251 | $ 51
Operating Segments [Member] | Rig Systems [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 22 |  | 65 |
Operating Segments [Member] | Rig Aftermarket [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 1 |  | 11 |
Operating Segments [Member] | Wellbore Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 29 |  | 83 | 9
Operating Segments [Member] | Completion & Production Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | $ 60 | (1) | $ 92 | 6
Unallocated Expenses and Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items |  | $ 2 |  | $ 36

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