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Provisions - Other provisions (Detail) - Miscellaneous other provisions [member] - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Provisions [Line Items]      
Other provisions at beginning of period € 392 € 432 € 499
Additional provisions, other provisions 161 143 169
Provision used, other provisions 109 127 178
Unused provision reversed, other provisions 49 61 57
Increase through adjustments arising from passage of time, other provisions (1) 1 2
Increase (decrease) through net exchange differences, other provisions (21) 10 (3)
Other provisions at end of period 372 392 432
IFRS 16 [Member]      
Provisions [Line Items]      
Other provisions at beginning of period € (6) 426  
Other provisions at end of period   € (6) € 426