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Commitments and Contingencies - Summary of Other Commitments and Contingencies (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Commitments And Contingencies [abstract]    
Guarantees € 437 € 483
Standby letters of credit 12 12
Share of contingent liabilities incurred in relation to interests in joint ventures 49 39
Other guarantees 14 16
Other commitments and contingent liabilities € 7 € 32