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Summary of Significant Accounting Policies - Goodwill is Identified by Segment (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | $ 7,172 | $ 6,151 |
Goodwill acquired during period | 1,903 | 1,000 | 377
Currency translation adjustments and other | (26) | 21 |
Goodwill, Ending Balance | 9,049 | 7,172 | 6,151
Rig Technology [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 2,386 | 1,959 |
Goodwill acquired during period | 262 | 412 |
Currency translation adjustments and other | (5) | 15 |
Goodwill, Ending Balance | 2,643 | 2,386 |
Petroleum Services & Supplies [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 4,333 | 4,089 |
Goodwill acquired during period | 1,363 | 241 |
Currency translation adjustments and other | (13) | 3 |
Goodwill, Ending Balance | 5,683 | 4,333 |
Distribution & Transmission [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 453 | 103 |
Goodwill acquired during period | 278 | 347 |
Currency translation adjustments and other | (8) | 3 |
Goodwill, Ending Balance | $ 723 | $ 453 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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