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Restructuring - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) position | Sep. 30, 2017 USD ($) position | Sep. 30, 2018 USD ($) position | Sep. 30, 2017 USD ($) position | Dec. 31, 2018 USD ($)
Restructuring and Related Activities [Abstract] |  |  |  |  |
Total pretax restructuring costs | $ 169 | $ 180 | $ 508 | $ 605 |
Cumulative restructuring costs incurred to date since program inception | $ 14,000 |  | $ 14,000 |  |
Positions eliminated since inception of program (in positions) | position | 45,220 |  | 45,220 |  |
Percentage estimate of cumulative pretax costs that will result in cash outlays (primarily from employee separation expense) (as percent) |  |  | 66.67% |  |
Percentage estimate of cumulative pretax costs that will be non-cash (primarily from accelerated depreciation of facilities) (as percent) |  |  | 33.33% |  |
Number of positions eliminated | position | 525 | 205 | 1,870 | 1,225 |
Forecast |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Estimated costs related to restructuring program activities |  |  |  |  | $ 50

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- Definition Amount of costs incurred to date for the specified 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 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: 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 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(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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