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Impairment, Restructuring Charges and Other Related Closure Costs - Summary of Impairment, Restructuring Charges and Other Related Closure Costs (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment | $ (13) | $ (16) | $ (24) | $ (109)
Restructuring charges |  | (37) | (41) | (178)
Other related closure costs |  | (12) | (25) | (5)
Total impairment, restructuring charges and other related closure costs |  | (65) | (90) | (292)
$600-650 Million Net Opex Plan [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | (17) | (88)
Other related closure costs |  | (2) | (7) |
Total impairment, restructuring charges and other related closure costs |  | (2) | (24) | (88)
Manufacturing Consolidation [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment |  |  |  | (29)
Restructuring charges |  | (1) | (8) | (8)
Other related closure costs |  | (10) | (4) |
Total impairment, restructuring charges and other related closure costs |  | (11) | (12) | (37)
EPS Restructuring Plan [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | (36) | (16) |
Other related closure costs |  |  | (14) |
Total impairment, restructuring charges and other related closure costs |  | (36) | (30) |
Long-lived Asset Impairment Charge [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment |  | (16) | (24) |
Total impairment, restructuring charges and other related closure costs |  | $ (16) | $ (24) |
ST-Ericsson Restructuring Plan [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  |  | (6)
Other related closure costs |  |  |  | (3)
Total impairment, restructuring charges and other related closure costs |  |  |  | (9)
ST-Ericsson Exit [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment |  |  |  | (17)
Restructuring charges |  |  |  | (69)
Total impairment, restructuring charges and other related closure costs |  |  |  | (86)
Digital Restructuring Plan [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment |  |  |  | (2)
Restructuring charges |  |  |  | (1)
Other related closure costs |  |  |  | (2)
Total impairment, restructuring charges and other related closure costs |  |  |  | (5)
Goodwill and Other Intangible Impairment Charge [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment |  |  |  | (56)
Total impairment, restructuring charges and other related closure costs |  |  |  | (56)
Assets Held for Sale Impairment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment |  |  |  | (5)
Total impairment, restructuring charges and other related closure costs |  |  |  | (5)
Other Restructuring Initiatives [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  |  | (6)
Total impairment, restructuring charges and other related closure costs |  |  |  | $ (6)

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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