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Taxation - Additional Information (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Unused tax losses for which deferred tax asset recognised or not € 4,808 € 4,790
Unused tax credits for which deferred tax asset recognised or not 454 524
Unused tax losses for which no deferred tax asset recognised 4,246 4,272
Unused tax credits for which no deferred tax asset recognised 429 497
Tax losses for which deferred tax has not been recognized and which have a date to expire 4,195 4,108
Other deductible temporary differences for which no deferred tax asset recognised 1,445 48
Aggregate amount of temporary differences associated with undistributed earnings of subsidiaries for which deferred tax liabilities have not been recognised 2,097 2,476
Uncertain tax provision 879 € 787
Uncertain tax provision for amortization of intangible asset 186  
Adjustment of uncertain tax provision related to amortization of goodwill 59  
Interest expense for which no Deferred tax asset has been recognised € 1,193