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Income Tax - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Loss Carryforwards [Line Items] |  |  |
Netherlands statutory income taxes rate | 25.00% | 25.00% | 25.50%
Significant losses in countries subject to tax holidays | $ 320 | $ 131 | $ 91
Effect of the tax benefits on basic earnings per share | $ 0.04 | $ 0.13 | $ 0.09
Maximum Percentage of Tax reduction from Tax holidays | 100.00% |  |
Legal inflationary index | 0.76% |  |
Deferred tax benefit (expense) | 0 | 19 |
Unrecognized tax benefits | 26 |  |
Foreign Subsidiaries And Corporate Joint Ventures [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Cumulative amount of distributable earnings | 1,306 |  |
St Ericsson's [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax assets on tax loss carryforwards | $ 191 |  |

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- Definition The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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