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Operating Segment Information - Summary of Segment adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA € 431 € 377 € 343
Metal price lag 22 4 (34)
Start-up and development costs (17) (25) (21)
Manufacturing system and process transformation costs (2) (5) (11)
Wise integration and acquisition costs   (2) (14)
Wise one-time costs   (20) (38)
Wise purchase price adjustment   20  
Share based compensation costs (8) (6) (7)
Gains / (Losses) on pension plan amendments 20   (5)
Depreciation and amortization (171) (155) (140)
Impairment     (457)
Restructuring costs (4) (5) (8)
Unrealized gains on derivatives 57 71 (20)
Unrealized exchange (losses) /gains from the remeasurement of monetary assets and liabilities - net (4) 3 (3)
Losses on disposals (3) (10) (5)
Other   (1) (6)
Income / (loss) from operations 321 246 (426)
Finance costs - net (243) (167) (155)
Share of loss of joint-ventures (29) (14) (3)
Income / (Loss) before income tax 49 65 (584)
Income tax (expense) / benefit (80) (69) 32
Net loss (31) (4) (552)
P&ARP [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA 202 201 183
A&T [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA 133 103 103
Holdings & Corporate [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA (23) (29) (23)
AS&I [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA 119 € 102 € 80
Start-up and development costs € (16)