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Other Cost by Segment (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] |  |  |  |
Other costs | $ 48 | $ 6 | $ 80 | $ 29
Rig Technology [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other costs | 12 | 5 | 33 | 11
Petroleum Services & Supplies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other costs |  | 1 | 3 | 17
Distribution & Transmission [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other costs | $ 36 |  | $ 44 | $ 1

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- Definition The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. + 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 210.5-03.3) -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 3 -Article 5 + Details
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Period Type: | duration

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- Details
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Period Type: | duration