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Business Segments (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 5,319 | $ 3,740 | $ 14,356 | $ 10,399
Total Operating Profit | 898 | 772 | 2,654 | 2,089
Percentage as of operating profit to revenue | 16.90% | 20.60% | 18.50% | 20.10%
Rig Technology [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 2,547 | 1,970 | 7,211 | 5,472
Total Operating Profit | 598 | 523 | 1,699 | 1,456
Percentage as of operating profit to revenue | 23.50% | 26.50% | 23.60% | 26.60%
Petroleum Services & Supplies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,717 | 1,460 | 5,197 | 4,084
Total Operating Profit | 383 | 298 | 1,161 | 777
Percentage as of operating profit to revenue | 22.30% | 20.40% | 22.30% | 19.00%
Distribution & Transmission [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,315 | 480 | 2,659 | 1,313
Total Operating Profit | 42 | 37 | 131 | 90
Percentage as of operating profit to revenue | 3.20% | 7.70% | 4.90% | 6.90%
Unallocated/Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (260) | (170) | (711) | (470)
Total Operating Profit | $ (125) | $ (86) | $ (337) | $ (234)

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