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Restructuring and Other Charges - 2019 Actions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($) employee | Dec. 31, 2018 USD ($) employee
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | $ 182 | $ 582 | $ 163
Business exit costs |  |  | 7 |
Gain (loss) on sale of assets |  | 3 | 1 |
Non-cash asset impairments (O) |  | 5 | 442 | $ 9
Impairment Of Disks |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 428 |  | 428 |
Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | $ 113 | $ 69 |
Number of employees associated with layoff costs | employee |  | 4,301 | 917 |
Employee Severance | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 23 | 494 | 36
UK Forgings |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | $ 46 |
Impairment For Trade Name Intangible Asset And Fixed Assets |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | 14 |
Small Additive Business |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | 13 |
Corporate Aircraft |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | 12 |
Pension Settlement Cost |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | $ 8 | 9 | $ 96
Special Termination Benefits |  |  |  |
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 |  | (21) | (6) | $ (8)
Impairment Of A Cost Method Investment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | $ 5 | 5 |
Engine Products | Disks Long Lived Asset Group |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Non-cash asset impairments (O) |  |  | $ 247 |
Engine Products | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 1,706 | 103 | 34
Engineered Structures | Disks Long Lived Asset Group |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Non-cash asset impairments (O) |  |  | $ 181 |
Engineered Structures | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 805 | 128 |
Fastening Systems | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 1,675 | 132 | 55
Forged Wheels | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 92 | 60 |

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