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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) employee | Jun. 30, 2019 USD ($) employee | Jun. 30, 2020 USD ($) employee | Jun. 30, 2019 USD ($) employee
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 105 | $ 472 | $ 144 | $ 516
Restructuring and other charges (benefits) after tax | 80 | 377 | 114 | 411
Reversal of impairment charge due to reclassification of assets | 7 |  |  |
Reversal of impairment charge due to reclassification of assets, after tax | 7 |  |  |
Gain on sale of assets | (2) | (5) | (4) | (7)
Layoff costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 54 | 15 | 76 | 68
Restructuring and other charges (benefits) after tax | 38 | 11 | 55 | 52
Pension Settlement and Contribution Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 64 |  | 64 |
Restructuring and other charges (benefits) after tax | $ 53 |  | $ 53 |
Restructuring Programs Layoffs 2020 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee | 2,521,000,000 |  | 2,981,000,000 |
Other exit costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 2 |  | $ 5 |
Restructuring and other charges (benefits) after tax | 2 |  | 5 |
Reversal of Prior Period Programs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | (8) | (3) | (10) | (4)
Restructuring and other charges (benefits) after tax | (6) | (3) | (8) | (4)
UK Forgings |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 6 |
Restructuring and other charges (benefits) after tax | $ 6 |  |  |
Impairments of Assets Associated with Agreement to Sell Aerospace Components Business |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 5 |
Restructuring and other charges (benefits) after tax |  |  | 5 |
Sale of Assets |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain on sale of assets |  |  | 2 |
Gain on sale of assets, net of tax |  |  | $ 2 |
Impairment of Disks |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 428 |  | 428
Restructuring and other charges (benefits) after tax |  | 345 |  | $ 345
Asset impairment charges |  | $ 428 |  |
Restructuring Programs Layoffs 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 220,000,000 |  | 901,000,000
Other Exit Costs from Lease Terminations |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | $ 12 |  | $ 12
Restructuring and other charges (benefits) after tax |  | 9 |  | 9
Pension Settlement Cost |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 2 |  | 4
Restructuring and other charges (benefits) after tax |  | 1 |  | 3
Impairment of Property, Plant and Equipment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 6 |  | 6
Restructuring and other charges (benefits) after tax |  | $ 5 |  | 5
Executive Severance Net of the Benefit of Forfeited Executive Stock Compensation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  |  | 2
Restructuring and other charges (benefits) after tax |  |  |  | 1
Other Exit Cost Lease Termination Loss |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  |  | (3)
Restructuring and other charges (benefits) after tax |  |  |  | (3)
Elimination of Life Insurance Benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  |  | (15)
Restructuring and other charges (benefits) after tax |  |  |  | $ (12)
Fastening Systems | Restructuring Programs Layoffs 2020 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee | 1,169,000,000 |  | 1,275,000,000 |
Fastening Systems | Restructuring Programs Layoffs 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 39,000,000 |  | 132,000,000
Engine Products | Restructuring Programs Layoffs 2020 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee | 1,116,000,000 |  | 1,291,000,000 |
Engine Products | Impairment of Disks |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairment charges |  | $ 247 |  |
Engine Products | Restructuring Programs Layoffs 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 53,000,000 |  | 103,000,000
Engineered Structures | Restructuring Programs Layoffs 2020 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee | 200,000,000 |  | 300,000,000 |
Engineered Structures | Impairment of Disks |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairment charges |  | $ 181 |  |
Engineered Structures | Restructuring Programs Layoffs 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 53,000,000 |  | 112,000,000
Forged Wheels | Restructuring Programs Layoffs 2020 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee | 36,000,000 |  | 92,000,000 |
Forged Wheels | Restructuring Programs Layoffs 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 6,000,000 |  | 60,000,000
Corporate Segment | Restructuring Programs Layoffs 2020 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  |  | 23,000,000 |
Corporate Segment | Restructuring Programs Layoffs 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  | 69,000,000 |  | 494,000,000
Small Additive Business |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Loss on sale of business |  |  |  | $ 12
Loss on sale of business, net of tax |  |  |  | $ 9
Small Additive Business | Engineered Structures |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Loss on sale of business |  | $ 12 |  |
Loss on sale of business, net of tax |  | $ 9 |  |

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