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Business Segments - Operating Results by Segment (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |
Revenue | $ 5,307 | $ 4,303
Total Operating Profit | 751 | 877
Percentage as of operating profit to revenue | 14.20% | 20.40%
Rig Technology [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 2,628 | 2,259
Total Operating Profit | 550 | 547
Percentage as of operating profit to revenue | 20.90% | 24.20%
Petroleum Services & Supplies [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 1,701 | 1,704
Total Operating Profit | 255 | 388
Percentage as of operating profit to revenue | 15.00% | 22.80%
Distribution & Transmission [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 1,227 | 564
Total Operating Profit | 63 | 43
Percentage as of operating profit to revenue | 5.10% | 7.60%
Unallocated/Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | (249) | (224)
Total Operating Profit | $ (117) | $ (101)

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