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Post-employment benefits - Plan assets allocation (Detail) - Plan assets [member] - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Post-employment benefits - Text Details (Detail) [Line Items]      
Net defined benefit liability (asset) € 2,164 € 2,137 € 3,095
Assets not quoted in active market [Member]      
Post-employment benefits - Text Details (Detail) [Line Items]      
Debt instruments, amount contributed to fair value of plan assets 12 14  
Equity instruments, amount contributed to fair value of plan assets   457  
Other assets, amount contributed to fair value of plan assets 329 318  
Assets quoted in active market [Member]      
Post-employment benefits - Text Details (Detail) [Line Items]      
Debt instruments, amount contributed to fair value of plan assets 1,294 1,142  
Equity instruments, amount contributed to fair value of plan assets 368 69  
Other assets, amount contributed to fair value of plan assets € 161 € 137