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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring reserve beginning balance |  |  | $ 25 | $ 58 |  | $ 58
Cash payments |  |  | (65) |  |  | (49)
Restructuring charges |  |  | 630 |  |  | 124
Other |  |  | (541) |  |  | (108)
Restructuring reserve ending balance | $ 49 |  | 49 |  |  | 25
Restructuring and other charges (D) | 119 | $ (2) | 630 | 20 |  |
Layoff costs |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring reserve beginning balance |  |  | 10 | 56 |  | 56
Cash payments |  |  | (61) |  |  | (47)
Restructuring charges |  |  | 45 |  |  | 111
Other |  |  | 50 |  |  | (110)
Restructuring reserve ending balance | 44 |  | 44 |  |  | 10
Restructuring and other charges (D) | (1) | $ (1) | (4) |  |  |
Other exit costs |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring reserve beginning balance |  |  | 15 | $ 2 |  | 2
Cash payments |  |  | (4) |  |  | (2)
Restructuring charges |  |  | 585 |  |  | 13
Other |  |  | (591) |  |  | 2
Restructuring reserve ending balance | 5 |  | 5 |  |  | 15
Restructuring and other charges (D) |  |  | 12 |  |  |
Employee Severance Cost, Reclassification Of Pension Costs |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Other |  |  |  |  |  | 119
Employee Severance Costs, Credit In Post-Retirement Costs |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  |  |  |  | (28)
Employee Severance, Reversal Of Prior Restructuring |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  |  |  |  | $ (19)
Elimination Of Life Insurance Benefits |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | (58) |  |  |
Other, Pension Settlement Cost |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | 8 |  |  |
Impairment Of Disks |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | 428 |  |  |
Asset Impairment associated with the sale of business |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) | $ 102 |  |  |  |  |
Other Exit Costs, Impairment Of Intangibles And Property Plant and Equipment |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | 24 |  |  |
Loss On Sale Related To Small Additive Business |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | 12 |  |  |
Other Exit Cost Lease Termination Loss |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | 12 |  |  |
Accelerated Depreciation |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | 6 |  |  |
Other Exit Costs, Credit |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | 2 |  |  |
Other Exit Costs, Reclassification Of Lease Exit Costs |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Restructuring and other charges (D) |  |  | $ (9) |  |  |
Scenario, Forecast | Layoff costs |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Cash payments |  |  |  |  | $ (15) |

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