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Business Segments - Other Items by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Total other items | $ 17 | $ 32 | $ 139 | $ 50
Operating Segments [Member] | Rig Systems [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 3 |  | 43 |
Operating Segments [Member] | Rig Aftermarket [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 2 |  | 10 |
Operating Segments [Member] | Wellbore Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | 9 | 6 | 54 | 9
Operating Segments [Member] | Completion & Production Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items | $ 3 | 1 | $ 32 | 7
Unallocated Expenses and Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total other items |  | $ 25 |  | $ 34

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