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Restructuring and Other Charges - 2016 Actions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) position | Dec. 31, 2016 USD ($) facility position employee
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | $ 9 | $ 165 | $ 155
Restructuring and other charges after tax |  | 9 | $ 143 | 114
Number of employees associated with layoff costs | position |  |  | 880 |
Layoff costs |  | 20 | $ 64 | 68
Cash payments for restructuring |  | 49 | $ 65 | $ 86
United Kingdom |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | employee |  |  |  | 60
Other exit costs |  |  |  | $ 4
Layoff costs |  |  |  | 2
Tennessee | Alcoa Corporation | Toll Processing and Services Agreement |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  |  | $ 21
Number of employees associated with layoff costs | position |  |  |  | 145
Other exit costs |  |  |  | $ 9
Layoff costs |  |  |  | 7
RTI |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  |  | 3
Restructuring and other charges after tax |  |  |  | 2
Engineered Products and Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  |  | 400 |
Global Rolled Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  |  | 245 |
Transportation and Construction Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  |  | 135 |
Other exit costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | 19 | $ 69 | 57
Restructuring and other charges after tax |  | 15 | 47 | 46
Cash payments for restructuring |  | 2 | 6 | 13
Other exit costs | Tennessee | Alcoa Corporation | Toll Processing and Services Agreement |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other exit costs |  |  |  | 2
Shutdown and Curtailment Actions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  |  | 37
Restructuring and other charges after tax |  |  |  | 24
Closure Of Five Facility |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  |  | 20
Restructuring and other charges after tax |  |  |  | $ 14
Number of facilities closed | facility |  |  |  | 5
Number of employees associated with layoff costs | position |  |  |  | 280
Restructuring Programs Layoffs 2016 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  |  | $ 53
Restructuring and other charges after tax |  |  |  | $ 33
Number of employees associated with layoff costs | position |  |  |  | 1,315
Cash payments for restructuring |  | 4 |  |
Restructuring charges for layoffs |  |  | 28 |
Restructuring Programs Layoffs 2016 | Engineered Products and Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 1,045
Restructuring Programs Layoffs 2016 | Global Rolled Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 30
Restructuring Programs Layoffs 2016 | Transportation and Construction Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 30
Restructuring Programs Layoffs 2016 | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of employees associated with layoff costs | position |  |  |  | 210
Other Miscellaneous Charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  | 12 | $ 11
Restructuring and other charges after tax |  |  |  | 8
Pension Settlement Cost |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges | $ 96 | 96 |  | 2
Restructuring and other charges after tax |  | 75 |  | 1
Other Adjustments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | 8 | (11) | 25
Restructuring and other charges after tax |  |  |  | 12
Asset Impairment and Accelerated Depreciation | United Kingdom |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  |  |  | 51
Asset Retirement Obligations | Tennessee | Alcoa Corporation | Toll Processing and Services Agreement |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other exit costs |  |  |  | 4
Environmental Remediation | Tennessee | Alcoa Corporation | Toll Processing and Services Agreement |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other exit costs |  |  |  | 3
Restructuring Programs Layoffs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges |  | 20 |  |
Restructuring and other charges after tax |  | $ 17 |  |
Restructuring charges for layoffs |  |  | $ 26 | $ 16

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