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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | $ 169 | $ 180 | $ 508 | $ 605
Separation Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 137 | 100 | 392 | 302
Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | (8) | 6 | (10) | 61
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 40 | 74 | 126 | 242
Materials and production |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 2 | 25 | 11 | 121
Materials and production | Separation Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 | 0 | 0 | 0
Materials and production | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 1 | 5 | 1 | 52
Materials and production | Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 1 | 20 | 10 | 69
Marketing and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 | 0 | 2 | 3
Marketing and administrative | Separation Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 | 0 | 0 | 0
Marketing and administrative | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 | 0 | 1 | 2
Marketing and administrative | Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 | 0 | 1 | 1
Research and development |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | (4) | 2 | 1 | 11
Research and development | Separation Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 | 0 | 0 | 0
Research and development | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | (9) | 1 | (12) | 7
Research and development | Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 5 | 1 | 13 | 4
Restructuring costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 171 | 153 | 494 | 470
Restructuring costs | Separation Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 137 | 100 | 392 | 302
Restructuring costs | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 | 0 | 0 | 0
Restructuring costs | Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | $ 34 | $ 53 | $ 102 | $ 168

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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