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Taxation (Tables)
 6 Months Ended
Jun. 30, 2021
Text Block [Abstract]  
Summary of Tax Effects of Components of Other Comprehensive Income
Tax effects of components of other comprehensive income were as follows:
 
 
     First Half 2021      First Half 2020  
€ million
    Before
tax		      Tax
(charge)/
credit		     After
tax		      Before
tax		     Tax
(charge)/
credit		     After
tax		  
Gains/(losses) on
                                                   
Equity instruments at fair value through other comprehensive incom
e
      56        (1 )      55        19       1       20  
Cash flow hedges
      143        (6 )      137        71       (28 )      43  
Remeasurements of defined benefit pension plans
(a)
      1,404        (436 )      968        (242 )      41       (201 ) 
Currency retranslation gains/(losses)
      653        (36 )      617        (1,516 )      35       (1,481 ) 
    
 
 
     
 
 
    
 
 
     
 
 
    
 
 
    
 
 
  
Other comprehensive income
   
 
2,256
 
   
 
(479
) 
  
 
1,777
 
   
 
(1,668
) 
  
 
49
 
  
 
(1,619
) 
    
 
 
     
 
 
    
 
 
     
 
 
    
 
 
    
 
 
  
 
  (a)
Remeasurement of defined benefit pension plans in 2021 is driven by positive investment returns and increase in interest rates.