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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) employee | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) employee | Sep. 30, 2019 USD ($) employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges | $ 22 | $ 56 |  |  | $ 166 | $ 572
Layoff costs | 17 | 0 |  |  | 93 | 68
Accelerated depreciation | 2 | 2 |  |  | 2 |
Settlements | 3 | 4 |  |  | 67 | (8)
Benefit from termination of deferred benefit plan | 3 |  |  |  | 3 |
Gain (loss) on sale of assets |  | 1 |  |  | 2 | 1
Impairment of assets to be disposed of |  |  |  |  | 5 |
Non-cash asset impairments | 0 | 8 |  |  | 0 | 442
Other exit costs |  |  |  |  |  | 4
Disks Long-Lived Asset Group |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Non-cash asset impairments |  |  | $ 428 |  |  | 428
Primary Research and Development Facility |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Non-cash asset impairments |  |  |  |  |  | 14
Small Additive Business |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  | (12)
Other postretirement benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Curtailment benefit | 2 | 0 |  |  | 2 | 58
Other postretirement benefits | US |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Curtailment benefit |  |  |  | $ 58 |  |
Pension benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Settlements | 8 | 4 |  |  | 72 | 8
Pension benefits | US |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Settlements |  | 4 |  |  |  | 8
Pension benefits | United Kingdom and United States |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Settlements |  |  |  |  | 72 |
Engine Products | Disks Long-Lived Asset Group |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Non-cash asset impairments |  |  | 247 |  |  | 247
Engineered Structures | Disks Long-Lived Asset Group |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Non-cash asset impairments |  |  | $ 181 |  |  | 181
Layoff costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges | $ 17 |  |  |  | $ 150 | $ 68
Number of employees associated with layoff costs | employee | 791 |  |  |  | 3,772 | 901
Layoff costs | Corporate expense |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | employee |  |  |  |  | 23 | 494
Layoff costs | Engine Products |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | employee | 415 |  |  |  | 1,706 | 103
Layoff costs | Engineered Structures |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | employee | 376 |  |  |  | 676 | 112
Layoff costs | Fastening Systems |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | employee |  |  |  |  | 1,275 | 132
Layoff costs | Forged Wheels |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | employee |  |  |  |  | 92 | 60
Facility closing |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  |  | $ 5 |
Facility closing | U.K. Forging Business |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  | $ 43 |  |  | 6 | $ 43
Lease terminations |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 12
Executive severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | 2
Employee severance, life insurance benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  | (16)
Reversal of prior period programs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  |  | $ (10) | $ (2)

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