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Post-employment benefits - Pre-tax costs for post-employment benefits (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Post-employment benefits - Text Details (Detail) [Line Items]        
Post-employment benefit expense, defined benefit plans € 31 € 46 € 95 € 58
Post-employment benefit expense, defined contribution plans   327 397 392
Post-employment benefits costs, pre-tax, total   374 492 450
Included in discontinued operations [Member]        
Post-employment benefits - Text Details (Detail) [Line Items]        
Post-employment benefit expense, defined benefit plans     26 29
Post-employment benefit expense, defined contribution plans     82 93
Included in financial expense [Member]        
Post-employment benefits - Text Details (Detail) [Line Items]        
Post-employment benefit expense, defined benefit plans   23 37 48
Included in income from operations [Member]        
Post-employment benefits - Text Details (Detail) [Line Items]        
Post-employment benefit expense, defined benefit plans   23 32 (19)
Post-employment benefit expense, defined contribution plans   € 327 € 315 € 299