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Intangible Assets (Including Goodwill) - Disclosure of Changes in Intangible Assets and Goodwill (Detail)
€ in Millions
 6 Months Ended
Jun. 30, 2018
EUR (€)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Goodwill, beginning balance € 403
Effects of changes in foreign exchange rates 11
Goodwill, ending balance 414
Intangible assets (excluding goodwill), beginning balance 68
Intangible assets (excluding goodwill), additions 5
Intangible assets (excluding goodwill), amortization expense (6)
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates 1
Intangible assets (excluding goodwill), ending balance 68
Gross value [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Goodwill, ending balance 414
Intangible assets (excluding goodwill), ending balance 195
Accumulated amortization and impairment [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance (127)
Technology [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), beginning balance 24
Intangible assets (excluding goodwill), amortization expense (2)
Intangible assets (excluding goodwill), ending balance 22
Technology [member] | Gross value [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance 83
Technology [member] | Accumulated amortization and impairment [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance (61)
Computer software [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), beginning balance 18
Intangible assets (excluding goodwill), additions 1
Intangible assets (excluding goodwill), amortization expense (4)
Intangible assets (excluding goodwill), transfer during the period 2
Intangible assets (excluding goodwill), ending balance 17
Computer software [member] | Gross value [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance 58
Computer software [member] | Accumulated amortization and impairment [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance (41)
Customer relationships [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), beginning balance 15
Intangible assets (excluding goodwill), ending balance 15
Customer relationships [member] | Gross value [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance 39
Customer relationships [member] | Accumulated amortization and impairment [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance (24)
Work in progress [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), beginning balance 9
Intangible assets (excluding goodwill), additions 4
Intangible assets (excluding goodwill), transfer during the period (2)
Intangible assets (excluding goodwill), effects of changes in foreign exchange rates 1
Intangible assets (excluding goodwill), ending balance 12
Work in progress [member] | Gross value [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance 13
Work in progress [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)
Other intangible assets [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), beginning balance 2
Intangible assets (excluding goodwill), ending balance 2
Other intangible assets [member] | Gross value [member]  
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]  
Intangible assets (excluding goodwill), ending balance € 2