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Restructuring and Other Charges - 2019 Actions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) position | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) position | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) position
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | $ 620 | $ 9 | $ 165
Restructuring and other charges after tax |  |  |  | 512 | 9 | 143
Non-cash asset impairments |  |  |  | 570 | 13 | $ 58
Asset impairment charges, net of tax |  |  |  | 477 |  |
Number of employees associated with layoff costs | position |  |  |  |  |  | 880
Gain (loss) on disposition of assets, before tax |  |  |  | (7) | (10) | $ 513
Gain on disposition of assets, after tax |  |  |  |  | 81 |
Cash payments for restructuring |  |  |  | 79 | 49 | 65
Impairment Of Disks |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  | $ 428 |  | 428 |  |
Restructuring and other charges after tax |  |  |  | 345 |  |
Asset Impairment Associated With The Sale Of Business |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 112 |  |
Restructuring and other charges after tax |  |  |  | 109 |  |
Sale Of Company's Brazilian Rolling Mill Operations |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 53 |  |
UK Forgings |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 46 |  |
Small Additive Business |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 13 |  |
Impairment For Trade Name Intangible Asset And Fixed Assets |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 25 |  |
Restructuring and other charges after tax |  |  |  | 19 |  |
Impairment Of A Cost Method Investment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 5 |  |
Restructuring and other charges after tax |  |  |  | 4 |  |
Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 103 | 20 |
Restructuring and other charges after tax |  |  |  | $ 78 | 17 |
Number of employees associated with layoff costs | position |  |  |  | 1,310 |  |
Other Exit Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | $ 26 | 19 | 69
Restructuring and other charges after tax |  |  |  | 21 | 15 | 47
Cash payments for restructuring |  |  |  | 5 | 2 | 6
Corporate Aircraft |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 12 |  |
Restructuring, Accelerated Depreciation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 9 |  |
Executive Severance Net Of The Benefit Of Forfeited Executive Stock Compensation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 2 |  |
Various Other Exit Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 4 |  |
Pension Settlement Cost |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | 9 | 96 |
Restructuring and other charges after tax |  |  |  | 7 | 75 |
Elimination Of Life Insurance Benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | (58) |  |
Restructuring and other charges after tax |  |  |  | (45) |  |
Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges |  |  |  | (10) |  |
Restructuring and other charges after tax |  |  |  | (9) |  |
Cash payments for restructuring |  |  |  | $ 74 | 47 | $ 59
Restructuring Programs Layoffs 2019 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 1,310 |  |
Approximate number of employees already laid off | position | 947 |  |  | 947 |  |
Cash payments for restructuring |  |  |  | $ 65 |  |
Global Rolled Products |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  |  |  | 336
Global Rolled Products | Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 484 |  |
Corporate Segment | Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 460 |  |
Engineered Products And Solutions | Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 366 |  |
Texarkana, Texas Rolling Mill |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain (loss) on disposition of assets, before tax | $ 20 |  |  | $ 20 | $ 154 |
Gain on disposition of assets, after tax | $ 15 |  | $ 119 | $ 17 |  |

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