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Financial Risks - Summary of Composition of Impairment Losses and Recoveries (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of impairment loss recognised or reversed for cash-generating unit [abstract]    
Other (none individually greater than EUR 25 million) € (49) € (24)
Subtotal (49) (24)
Total recoveries 66 34
Sub-total 66 34
Net (impairments) and recoveries € 17 € 10