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Intangible Assets (Including Goodwill) - Disclosure of Changes in Intangible Assets and Goodwill (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill, beginning balance € 457 € 443
Effects of changes in foreign exchange rates (54) 14
Goodwill, ending balance 403 457
Intangible assets (excluding goodwill), beginning balance 79 78
Intangible assets (excluding goodwill), additions 6 5
Intangible assets (excluding goodwill), amortization expense (12) (11)
Intangible assets (excluding goodwill), transfer during the period 2  
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates (7) 7
Intangible assets (excluding goodwill), ending balance 68 79
Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill, beginning balance 457  
Goodwill, ending balance 403 457
Intangible assets (excluding goodwill), beginning balance 198  
Intangible assets (excluding goodwill), ending balance 186 198
Accumulated amortization and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance (119)  
Intangible assets (excluding goodwill), ending balance (118) (119)
Technology [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 28 28
Intangible assets (excluding goodwill), amortization expense (1) (1)
Intangible assets (excluding goodwill), transfer during the period 1  
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates (4) 1
Intangible assets (excluding goodwill), ending balance 24 28
Technology [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 91  
Intangible assets (excluding goodwill), ending balance 81 91
Technology [member] | Accumulated amortization and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance (63)  
Intangible assets (excluding goodwill), ending balance (57) (63)
Computer software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 21 23
Intangible assets (excluding goodwill), additions   1
Intangible assets (excluding goodwill), amortization expense (9) (9)
Intangible assets (excluding goodwill), transfer during the period 7 2
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates (1) 4
Intangible assets (excluding goodwill), ending balance 18 21
Computer software [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 52  
Intangible assets (excluding goodwill), ending balance 55 52
Computer software [member] | Accumulated amortization and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance (31)  
Intangible assets (excluding goodwill), ending balance (37) (31)
Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 18 18
Intangible assets (excluding goodwill), amortization expense (1) (1)
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates (2) 1
Intangible assets (excluding goodwill), ending balance 15 18
Customer relationships [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 43  
Intangible assets (excluding goodwill), ending balance 38 43
Customer relationships [member] | Accumulated amortization and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance (25)  
Intangible assets (excluding goodwill), ending balance (23) (25)
Work in progress [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 9 7
Intangible assets (excluding goodwill), additions 6 4
Intangible assets (excluding goodwill), transfer during the period (6) (2)
Intangible assets (excluding goodwill), ending balance 9 9
Work in progress [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 9  
Intangible assets (excluding goodwill), ending balance 9 9
Other intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 3 2
Intangible assets (excluding goodwill), amortization expense (1)  
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates   1
Intangible assets (excluding goodwill), ending balance 2 3
Other intangible assets [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 3  
Intangible assets (excluding goodwill), ending balance 3 € 3
Other intangible assets [member] | Accumulated amortization and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), ending balance € (1)