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Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Dec. 31, 2017 | Sep. 03, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Integration costs | [1] | $ 82 | $ 73 | $ 202 | $ 235 |  |
Enterprise-wide Cost Reduction/Productivity Plan [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  | 226 |  |  |
Expected restructuring cost |  | 1,200 |  | $ 1,200 |  |  |
Percentage of expected costs to be non-cash |  |  |  | 20.00% |  |  |
Manufacturing Plant Network Optimization [Member] | Enterprise-wide Cost Reduction/Productivity Plan [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected restructuring cost |  | 700 |  | $ 700 |  |  |
Restructuring costs incurred |  | 322 |  | 322 |  |  |
Centralization of Corporate and Platform Functions [Member] | Enterprise-wide Cost Reduction/Productivity Plan [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected restructuring cost |  | 450 |  | 450 |  |  |
Restructuring costs incurred |  | $ 252 |  | 252 |  |  |
Business Integration Costs [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  | $ 35 |  |  |
Hospira [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Integration costs |  |  |  |  |  |  | $ 1,000
Expected integration related costs, period |  |  |  | 3 years |  |  |
Hospira [Member] | Return of Acquired Rights [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  |  |  | $ 215 |
Hospira [Member] | Business Integration Costs [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  | $ 186 |  |  |
[1] | Integration costs represent external, incremental costs directly related to integrating acquired businesses, and primarily include expenditures for consulting and the integration of systems and processes. In the third quarter and first nine months of 2018, integration costs were primarily related to our acquisition of Hospira. In the third quarter and first nine months of 2017, integration costs primarily relate to our acquisitions of Hospira and Medivation. The first nine months of 2017 also include a net gain of $12 million related to the settlement of the Hospira U.S. qualified defined benefit pension plan (see Note 10).

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