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Restructuring - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 USD ($) position | Jun. 30, 2017 USD ($) position | Jun. 30, 2018 USD ($) position | Jun. 30, 2017 USD ($) position
Restructuring and Related Activities [Abstract] |  |  |  |
Total pretax restructuring costs | $ 235 | $ 210 | $ 339 | $ 425
Cumulative restructuring costs incurred to date since program inception | $ 13,800 |  | $ 13,800 |
Positions eliminated since inception of program (in positions) | position | 44,695 |  | 44,695 |
Estimated remaining costs related to restructuring program activities | $ 500 |  | $ 500 |
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 | 635 | 475 | 1,345 | 1,020

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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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