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Financial Risks - Summary of Composition of Impairment Losses and Recoveries (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of impairment loss recognised or reversed for cash-generating unit [abstract]    
Other (none individually greater than EUR 25 million) € (24) € (16)
Subtotal (24) (16)
Total recoveries 34 16
Sub-total 34 € 16
Net (impairments) and recoveries € 10