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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA € 498 € 448 € 398
Metal price lag   22 4
Start-up and development costs (21) (17) (25)
Manufacturing system and process transformation costs   (2) (5)
Wise integration and acquisition costs     (2)
Wise one-time costs     (20)
Wise purchase price adjustment     20
Share-based compensation costs (12) (8) (6)
Gains on pension plan amendments 36 20  
Depreciation and amortization (197) (171) (155)
Restructuring costs (1) (4) (5)
Unrealized (losses) / gains on derivatives (84) 57 71
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities-net   (4) 3
Gains / (losses) on disposals 186 (3) (10)
Other (1)   (1)
(Loss) / Income from operations 404 338 267
Finance costs-net (149) (260) (188)
Share of loss of joint-ventures (33) (29) (14)
Income before income tax 222 49 65
Income tax (expense) / benefit (32) (80) (69)
Net income / (loss) 190 (31) (4)
P&ARP [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA 243 204 204
A&T [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA 152 146 118
AS&I [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA 125 120 104
Start-up and development costs 21 16  
Holdings & Corporate [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Adjusted EBITDA € (22) € (22) € (28)