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Business Segments - Operating Results by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	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)

X

- Definition

Percentage as of operating profit to revenue.

+ References

No definition available.

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X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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