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Taxation - Tax Effects of Components of Other Comprehensive Income (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax relating to components of other comprehensive income [Abstract]      
Fair value gains/(losses) on financial instruments, Before tax € (61) € (15)  
Remeasurements of defined benefit pension plans, Before tax 1,620 (1,221)  
Currency retranslation gains/(losses), Before tax (1,024) 217  
Other comprehensive income, Before tax 535 (1,019)  
Fair value gains/(losses) on financial instruments, Tax (charge)/credit (14)    
Remeasurements of defined benefit pension plans, Tax (charge)/credit (338) 241  
Currency retranslation gains/(losses),Tax (charge)/credit 41    
Other comprehensive income, Tax (charge)/credit (311) 241  
Fair value gains/(losses) on financial instruments, After tax (75) (15) € 100
Remeasurements of defined benefit pension plans, After tax 1,282 (980) 884
Currency retranslation gains/(losses), After tax [1] (983) 217 € (481)
Other comprehensive income, After tax € 224 € (778)  
[1] Includes fair value gains/(losses) on net investment hedges and exchange differences in net investments in foreign operations of €(909) million (2016: €(365) million; 2015: €617 million).