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Operating Segment Information - Summary of Segment adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (Parenthetical) (Detail) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Start-up costs and development cost € (3) € (5) € (5) € (9)
AS&I [member]        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Start-up costs and development cost     € 5 € 9