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OPERATING SEGMENT INFORMATION - Segment Adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (Details) - EUR (€)
€ in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Adjusted EBITDA   € 465 € 562 € 498
Metal price lag   (8) (46) 0
Start-up and development costs   (5) (11) (21)
Bowling Green one-time costs related to the acquisition   0 (5) 0
Share based compensation costs   (15) (16) (12)
Gains on pension plan amendments   (2) 1 36
Depreciation and amortization   (259) (256) (197)
Impairment of assets   (43) 0 0
Restructuring costs   (13) (4) (1)
Unrealized gains / (losses) on derivatives   16 33 (84)
Unrealized exchange gains from the remeasurement of monetary assets and liabilities - net   1 0 0
(Losses) / gains on disposals   (4) (3) 186
Other   (8) 0 (1)
Income from operations   125 255 404
Finance costs - net   (159) (175) (149)
Share of income / (loss) of joint-ventures   0 2 (33)
(Loss) / income before income tax   (34) 82 222
Income tax benefit / (expense)   17 (18) (32)
Net (loss) / income   (17) 64 190
Losses reclassified from OCI as a result of hedge accounting discontinuation   6 0 0
COVID-19        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Procurement penalties and termination fees   (2)    
Losses reclassified from OCI as a result of hedge accounting discontinuation   6    
Novelis        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Sale of assets € 200      
Net gain on sale of assets       190
P&ARP        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Adjusted EBITDA   291 273 243
A&T        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Adjusted EBITDA   106 204 152
AS&I        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Adjusted EBITDA   88 106 125
H&C        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Adjusted EBITDA   € (20) € (21) € (22)