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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) position | Jun. 30, 2018 USD ($) position | Jun. 30, 2019 USD ($) position | Jun. 30, 2018 USD ($) position | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) position
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | $ 499 | $ 15 | $ 511 | $ 22 |  |
Restructuring and other charges (benefits) after tax | 397 | 12 | 407 | 17 |  |
Cash payments for restructuring |  |  | 43 |  |  | $ 49
Impairment Of Disks |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | 428 |  | 428 |  |  |
Restructuring and other charges (benefits) after tax | 345 |  | 345 |  |  |
Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | 30 | 4 | 95 | 8 |  |
Restructuring and other charges (benefits) after tax | $ 22 | 3 | $ 73 | $ 6 |  |
Number of employees associated with layoff costs | position | 350 |  | 1,127 | 40 |  |
Impairment for a trade name intangible asset and fixed assets |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | $ 16 |  | $ 16 |  |  |
Restructuring and other charges (benefits) after tax | 12 |  | 12 |  |  |
Other exit costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | 12 |  | 12 | $ 4 |  |
Restructuring and other charges (benefits) after tax | 9 |  | 9 | 3 |  |
Cash payments for restructuring |  |  | 3 |  |  | 2
Loss On Sale Related To Small Additive Business |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | 12 |  | 12 |  |  |
Restructuring and other charges (benefits) after tax | 9 |  | 9 |  |  |
Restructuring, Accelerated Depreciation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | 2 |  | 2 |  |  |
Restructuring and other charges (benefits) after tax | 2 |  | 2 |  |  |
Pension Settlement Cost |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | 2 |  | 4 |  |  |
Restructuring and other charges (benefits) after tax | 1 |  | 3 |  |  |
Layoff costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) | (3) | (5) | (3) |  |  |
Restructuring and other charges (benefits) after tax | $ (3) | (4) | (3) |  |  |
Cash payments for restructuring |  |  | 40 |  |  | $ 47
Executive Severance Net Of The Benefit Of Forfeited Executive Stock Compensation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) |  |  | 2 |  |  |
Restructuring and other charges (benefits) after tax |  |  | 1 |  |  |
Other Miscellaneous Charges |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) |  | 2 | 1 |  |  |
Restructuring and other charges (benefits) after tax |  | 2 | 1 |  |  |
Elimination Of Life Insurance Benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) |  |  | (58) |  |  |
Restructuring and other charges (benefits) after tax |  |  | $ (45) |  |  |
Pension Curtailment Charge |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) |  | 9 |  | 14 |  |
Restructuring and other charges (benefits) after tax |  | 7 |  | 11 |  |
New York |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) |  | 5 |  | 5 |  |
Restructuring and other charges (benefits) after tax |  | $ 4 |  | 4 |  |
Other Adjustments |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges (benefits) |  |  |  | 9 |  |
Restructuring and other charges (benefits) after tax |  |  |  | $ 7 |  |
Restructuring Programs Layoffs 2019 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position |  |  | 1,127 |  |  | 1,150
Approximate number of employees already laid off | position | 583 |  | 583 |  |  |
Cash payments for restructuring | $ 26 |  | $ 40 |  |  |
Transportation and Construction Solutions | Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position | 131 |  | 252 |  |  |
Engineered Products and Solutions | Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position | 125 | 24 | 301 | 24 |  |
Corporate Segment | Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position | 69 |  | 463 | 16 |  |
Global Rolled Products | Restructuring Programs Layoffs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees associated with layoff costs | position | 25 |  | 111 |  |  |
Scenario, Forecast | Layoff costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cash payments for restructuring |  |  |  |  | $ 15 |

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