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Restructuring - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 USD ($) position | Sep. 30, 2016 USD ($) position | Sep. 30, 2017 USD ($) position | Sep. 30, 2016 USD ($) position
Restructuring and Related Activities [Abstract] |  |  |  |
Total pretax restructuring costs | $ 180 | $ 212 | $ 605 | $ 759
Cumulative restructuring costs incurred to date since program inception | $ 13,200 |  | $ 13,200 |
Positions eliminated since inception of program (in positions) | position | 42,120 |  | 42,120 |
Estimated remaining costs related to restructuring program activities | $ 250 |  | $ 250 |
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 | 205 | 300 | 1,225 | 1,355

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -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)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -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)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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