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Operating Segment Information - Summary of Segment adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (Detail) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA € 151 € 127 € 268 € 220  
Metal price lag 20 7 24 20  
Start-up and development costs (5) (5) (9) (10)  
Manufacturing system and process transformation costs   (1)   (1)  
Share based compensation costs (3) (1) (6) (3)  
Gains on pension plan amendments       22  
Depreciation and amortization (46) (41) (90) (84)  
Restructuring costs       (2)  
Unrealized gains / (losses) on derivatives 11 (10) (43) 18  
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities - net   (1) 1 (5)  
Losses on disposals (3) (1) (4) (2)  
Other   (1) 1    
Income (loss) from operations 125 73 142 173  
Finance costs - net (36) (39) (70) (93)  
Share of loss of joint-ventures (9) (7) (12) (13) € (29)
Income before income tax 80 27 60 67  
Income tax expense (25) (12) (29) (39)  
Net income (loss) 55 15 31 28 € (31)
P&ARP [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA 75 57 126 98  
A&T [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA 43 41 77 69  
AS&I [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA 39 33 75 64  
Start-up and development costs 0   9 7  
Holdings & Corporate [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA € (6) € (4) € (10) € (11)