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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
Discontinued Operations [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 343 | 52 |
Goodwill acquired during period |  | 291 |
Currency translation adjustments and other | (10) |  |
Goodwill, Ending Balance | 333 | 343 |
Rig Systems [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 1,097 | 943 |
Goodwill acquired during period | 179 | 145 |
Currency translation adjustments and other | 3 | 9 |
Goodwill, Ending Balance | 1,279 | 1,097 |
Rig Aftermarket [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 649 | 556 |
Goodwill acquired during period | 256 | 89 |
Currency translation adjustments and other | 1 | 4 |
Goodwill, Ending Balance | 906 | 649 |
Wellbore Technologies [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 3,769 | 3,683 |
Goodwill acquired during period | 665 | 80 |
Currency translation adjustments and other | (9) | 6 |
Goodwill, Ending Balance | 4,425 | 3,769 |
Completion & Production Solutions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 1,314 | 917 |
Goodwill acquired during period | 803 | 395 |
Currency translation adjustments and other | (11) | 2 |
Goodwill, Ending Balance | $ 2,106 | $ 1,314 |

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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=35741047&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=35741047&loc=d3e13816-109267 + 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=35741047&loc=d3e13816-109267 + Details
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