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Impairment, Restructuring Charges and Other Related Closure Costs - Changes to Restructuring Provisions Recorded on Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Reserve Disclosures [Abstract]
Charges incurred	$ 108	$ 71	$ 93
Amounts paid	(73)
Manufacturing Restructuring Plan [Member]
Restructuring Reserve Disclosures [Abstract]
Charges incurred		34	26
Other Restructuring Initiatives [Member]
Restructuring Reserve Disclosures [Abstract]
Charges incurred	11	5	3
Changes to restructuring provisions [Member]
Restructuring Reserve Disclosures [Abstract]
Provision, beginning balance	53	136
Charges incurred	122	75
Adjustments for unused provisions	(14)	(4)
Amounts paid	(73)	(154)
Currency translation effect	3
Provision, ending balance	91	53
Changes to restructuring provisions [Member] | St-Ericsson April 2012 restructuring plan [Member]
Restructuring Reserve Disclosures [Abstract]
Provision, beginning balance
Charges incurred	73
Adjustments for unused provisions	(9)
Amounts paid	(25)
Currency translation effect	3
Provision, ending balance	42
Changes to restructuring provisions [Member] | St-Ericsson cost savings plan [Member]
Restructuring Reserve Disclosures [Abstract]
Provision, beginning balance	19
Charges incurred	22	26
Adjustments for unused provisions	(2)
Amounts paid	(28)	(6)
Currency translation effect		(1)
Provision, ending balance	11	19
Changes to restructuring provisions [Member] | St-Ericsson restructuring plan [Member]
Restructuring Reserve Disclosures [Abstract]
Provision, beginning balance	17	60
Charges incurred	1	7
Adjustments for unused provisions		(1)
Amounts paid	(12)	(50)
Currency translation effect		1
Provision, ending balance	6	17
Changes to restructuring provisions [Member] | Digital restructuring plan [Member]
Restructuring Reserve Disclosures [Abstract]
Provision, beginning balance
Charges incurred	13
Adjustments for unused provisions
Amounts paid	(1)
Currency translation effect
Provision, ending balance	12
Changes to restructuring provisions [Member] | Manufacturing Restructuring Plan [Member]
Restructuring Reserve Disclosures [Abstract]
Provision, beginning balance	4	57
Charges incurred	2	35
Adjustments for unused provisions		(1)
Amounts paid	(3)	(87)
Currency translation effect
Provision, ending balance	3	4
Changes to restructuring provisions [Member] | Other Restructuring Initiatives [Member]
Restructuring Reserve Disclosures [Abstract]
Provision, beginning balance	13	19
Charges incurred	11	7
Adjustments for unused provisions	(3)	(2)
Amounts paid	(4)	(11)
Currency translation effect
Provision, ending balance	$ 17	$ 13

X

- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 95-3

-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.



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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

+ References

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 146

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 95-3

-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.



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Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Number 95-3

-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 4: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost.

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-Publisher FASB

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-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.



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-Name Staff Accounting Bulletin (SAB)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-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.

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