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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, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill, beginning balance € 403 € 457
Effects of changes in foreign exchange rates 19 (54)
Goodwill, ending balance 422 403
Intangible assets (excluding goodwill), beginning balance 68 79
Intangible assets (excluding goodwill), additions 11 6
Intangible assets (excluding goodwill), amortization expense (13) (12)
Intangible assets (excluding goodwill), transfer during the period   2
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates 4 (7)
Intangible assets (excluding goodwill), ending balance 70 68
Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill, beginning balance 403  
Goodwill, ending balance 422 403
Intangible assets (excluding goodwill), beginning balance 186  
Intangible assets (excluding goodwill), ending balance 204 186
Accumulated amortization and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance (118)  
Intangible assets (excluding goodwill), ending balance (134) (118)
Technology [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 24 28
Intangible assets (excluding goodwill), amortization expense (3) (1)
Intangible assets (excluding goodwill), transfer during the period   1
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates 1 (4)
Intangible assets (excluding goodwill), ending balance 22 24
Technology [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 81  
Intangible assets (excluding goodwill), ending balance 84 81
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 (57)  
Intangible assets (excluding goodwill), ending balance (62) (57)
Computer software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 18 21
Intangible assets (excluding goodwill), additions 2  
Intangible assets (excluding goodwill), amortization expense (8) (9)
Intangible assets (excluding goodwill), transfer during the period 5 7
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates 1 (1)
Intangible assets (excluding goodwill), ending balance 18 18
Computer software [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 55  
Intangible assets (excluding goodwill), ending balance 65 55
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 (37)  
Intangible assets (excluding goodwill), ending balance (47) (37)
Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 15 18
Intangible assets (excluding goodwill), amortization expense (1) (1)
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates 1 (2)
Intangible assets (excluding goodwill), ending balance 15 15
Customer relationships [member] | Gross value [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 38  
Intangible assets (excluding goodwill), ending balance 39 38
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 (23)  
Intangible assets (excluding goodwill), ending balance (24) (23)
Work in progress [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 9 9
Intangible assets (excluding goodwill), additions 8 6
Intangible assets (excluding goodwill), transfer during the period (5) (6)
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates 1  
Intangible assets (excluding goodwill), ending balance 13 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 13 9
Other intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets (excluding goodwill), beginning balance 2 3
Intangible assets (excluding goodwill), additions 1  
Intangible assets (excluding goodwill), amortization expense (1) (1)
Intangible assets (excluding goodwill), ending balance 2 2
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), beginning balance (1)  
Intangible assets (excluding goodwill), ending balance € (1) € (1)