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Restructuring and Other Charges - 2020 Actions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) employee position | Dec. 31, 2019 USD ($) employee | Dec. 31, 2018 USD ($) employee
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | $ 182 | $ 582 | $ 163
Benefit from termination of plan |  | 3 |  |
Curtailment benefit |  |  |  | (9)
Impairment of assets to be disposed of |  | 5 |  |
Accelerated depreciation |  | 2 |  |
Gain (loss) on sale of assets |  | 3 | 1 |
Pension benefits paid |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | 69 |  |
Settlement |  | (76) | (9) | (96)
Curtailment benefit |  | 0 | 0 | (23)
Other postretirement benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Settlement |  | 0 | 0 | 0
Curtailment benefit | $ (9) | 2 | 58 | $ 28
Layoff costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | $ 113 | $ 69 |
Number of employees associated with layoff costs | employee |  | 4,301 | 917 |
Layoff costs | Pension benefits paid |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Settlement |  | $ (74) |  |
Layoff costs | Engine Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 1,706 | 103 | 34
Layoff costs | Fastening Systems |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 1,675 | 132 | 55
Layoff costs | Engineered Structures |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 805 | 128 |
Layoff costs | Forged Wheels |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 92 | 60 |
Layoff costs | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 23 | 494 | 36
U.K. and U.S. pension plan settlement accounting | Pension benefits paid |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Settlement |  | $ 74 |  |
Facility Closing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | 6 |  | $ 9
Facility Closing | U.K. Forging Business |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | 5 |  |
Impairment Of A Cost Method Investment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | 5 | $ 5 |
Asset Impairment Associated Facility Closure |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | 1 |  |
Reversal Of Prior Period Programs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges (E) |  | $ (21) | $ (6) | $ (8)
Restructuring Programs Layoffs Two Thousand Twenty |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  | 4,301 |  |
Approximate number of employees already laid off | position |  | 3,519 |  |

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