v3.22.0.1
Acquisitions and Divestitures (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 01, 2020
USD ($)
employee
Feb. 01, 2020
USD ($)
employee
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Oct. 31, 2018
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Cash payments to settle working capital and other adjustments     $ 2                  
Goodwill, Impairment Loss                   $ 65 $ 0 $ 0
Total sales                   7,504 5,675 7,277
Reclassification from properties, plants, and equipment, net       $ (2,712)           (2,651) (2,712)  
Reclassification from deferred income tax assets       (329)           (229) (329)  
Reclassification from other noncurrent liabilities and deferred credits       (102)           (85) (102)  
Cumulative effect of accounting change       1,447         $ 2,969 1,559 1,447 2,973
Adoption of accounting standard                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Reclassification from properties, plants, and equipment, net                       24
Reclassification from deferred income tax assets                       22
Reclassification from other noncurrent liabilities and deferred credits                       119
Cumulative effect of accounting change                 73     73
Disposed of by sale | Aluminum Rolling Mill in Itapissuma, Brazil                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Consideration received   $ 46                    
Gain (loss) on sale   $ (60)                    
Charges (credits) associated with sale           $ 6         53  
Cash payments to settle working capital and other adjustments       4                
Additional cash received as a post-closing adjustment               $ 1        
Total sales                     143  
Number of employees | employee   500                    
Disposed of by sale | Hard Alloy Extrusions Plant in South Korea                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Consideration received $ 55                      
Gain (loss) on sale 31                      
Goodwill, Impairment Loss $ 6                      
Additional cash received as a post-closing adjustment         $ 1              
Total sales                     51  
Number of employees | employee 160                      
Disposed of by sale | Texarkana Rolling Mill and Cast House                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Consideration received             $ 302          
Gain (loss) on sale                 $ 154      
Net book value             63          
Additional contingent consideration (up to)       $ 20     $ 50     25 $ 20  
Period post transaction closing date for measurement of various milestones required to achieve for additional contingent consideration             36 months          
Period Arconic Corporation will continue to produce aluminum slab at facility through lease back of cash house building and equipment             18 months          
Period after lease back period that Ta Chen will perform toll processing of metal for Arconic Corporation             6 months          
Period that Arconic Corp will supply Ta Chen with cold-rolled aluminum coil             24 months          
Fair value of contingent consideration                       $ 5
Deferred gain recognized as noncurrent liability                   $ 95