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Restructuring Program - Narrative (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended | 80 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 06, 2018 | Aug. 31, 2016 | May 06, 2014 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
2014-2018 Restructuring Program |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs |  | $ 5,700 | $ 3,500 |  |  |  |
Reallocation of previously approved capital expenditures to be spent on restructuring program cash costs |  | 600 |  |  |  |  |
2014-2018 Restructuring Program | Maximum |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Capital expenditures, authorized amount |  | 1,600 | $ 2,200 |  |  |  |
2014-2018 Restructuring Program | Program charges |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs |  | 4,100 |  |  |  |  |
2014-2018 Restructuring Program | Cash costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs |  | 3,100 |  |  |  |  |
2014-2018 Restructuring Program | Non-cash costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs |  | $ 1,000 |  |  |  |  |
Simplify to Grow Program |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs | $ 7,700 |  |  |  |  |  |
Restructuring and related cost, cost incurred |  |  |  | $ 363 | $ 448 | $ 631 | $ 4,703
Restructuring charges |  |  |  | 156 | 176 | 316 | 2,882
Cash severance and related costs |  |  |  | 169 | 162 |  |
Non-cash asset write-downs |  |  |  |  | 82 |  |
Non-cash adjustments |  |  |  | 6 |  |  |
Restructuring reserve |  |  |  | 304 | 301 | 373 | 304
Implementation costs |  |  |  | 207 | $ 272 | $ 315 | 1,821
Simplify to Grow Program | Maximum |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Capital expenditures, authorized amount | 2,300 |  |  |  |  |  |
Increase in restructuring program costs | 1,300 |  |  |  |  |  |
Increase in capital expenditures | 700 |  |  |  |  |  |
Simplify to Grow Program | Other current liabilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | 260 |  |  | 260
Simplify to Grow Program | Other long-term liabilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | $ 44 |  |  | $ 44
Simplify to Grow Program | Program charges |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs | 5,400 |  |  |  |  |  |
Simplify to Grow Program | Cash costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs | 4,100 |  |  |  |  |  |
Simplify to Grow Program | Non-cash costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Approved restructuring program costs | $ 1,300 |  |  |  |  |  |

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