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Restructuring and other cost savings initiatives (Tables) | 12 Months Ended
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Dec. 31, 2017
Restructuring and Related Activities [Abstract] |
Summary of restructuring charges by type of activity | The following tables summarize charges recorded related to the restructuring plan by type of activity and the locations recognized within the Consolidated Statements of Income (in millions):
|  | Year ended December 31, 2015
|  | Separation costs |  | Asset impairments/ disposals |  | Accelerated depreciation |  | Other |  | Total
Cost of sales |  | $ | — |  |  | $ | — |  |  | $ | 50 |  |  | $ | 2 |  |  | $ | 52 |
Research and development |  | — |  |  | — |  |  | 36 |  |  | 28 |  |  | 64 |
Selling, general and administrative |  | — |  |  | — |  |  | 14 |  |  | 42 |  |  | 56 |
Other |  | 49 |  |  | (111 | ) |  | — |  |  | 4 |  |  | (58 | )
Total |  | $ | 49 |  |  | $ | (111 | ) |  | $ | 100 |  |  | $ | 76 |  |  | $ | 114 |
|  | Year ended December 31, 2014
|  | Separation costs |  | Asset impairments |  | Accelerated depreciation |  | Other |  | Total
Cost of sales |  | $ | — |  |  | $ | 81 |  |  | $ | 23 |  |  | $ | — |  |  | $ | 104 |
Research and development |  | — |  |  | — |  |  | 28 |  |  | 21 |  |  | 49 |
Selling, general and administrative |  | — |  |  | — |  |  | 4 |  |  | 5 |  |  | 9 |
Other |  | 377 |  |  | 6 |  |  | — |  |  | 13 |  |  | 396 |
Total |  | $ | 377 |  |  | $ | 87 |  |  | $ | 55 |  |  | $ | 39 |  |  | $ | 558 |
Restructuring liabilities roll forward | The following table summarizes the expenses (excluding non-cash charges) and payments related to the restructuring plan (in millions):
| Years ended December 31,
| Separation costs |  | Other |  | Total
Restructuring liabilities as of December 31, 2013 | $ | — |  |  | $ | — |  |  | $ | — |
Expense | 353 |  |  | 32 |  |  | 385 |
Payments | (132 | ) |  | (9 | ) |  | (141 | )
Restructuring liabilities as of December 31, 2014 | 221 |  |  | 23 |  |  | 244 |
Expense | 52 |  |  | 80 |  |  | 132 |
Payments | (178 | ) |  | (80 | ) |  | (258 | )
Restructuring liabilities as of December 31, 2015 | 95 |  |  | 23 |  |  | 118 |
Expense | 6 |  |  | 13 |  |  | 19 |
Payments | (90 | ) |  | (27 | ) |  | (117 | )
Restructuring liabilities as of December 31, 2016 | 11 |  |  | 9 |  |  | 20 |
Expense | 72 |  |  | 7 |  |  | 79 |
Payments | (20 | ) |  | $ | (11 | ) |  | (31 | )
Restructuring liabilities as of December 31, 2017 | $ | 63 |  |  | $ | 5 |  |  | $ | 68 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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