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Commitments and Contingencies - Summary of Other Commitments and Contingencies (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Other Commitments And Contingencies [abstract]    
Guarantees € 380 € 437
Standby letters of credit 12 12
Share of contingent liabilities incurred in relation to interests in joint ventures 14 49
Other guarantees 13 14
Other commitments and contingent liabilities € 7 € 7