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Shareholders' Equity - Summary of Share Premium (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of share premium [Line Items]      
Beginning balance € 7,487 € 7,731 € 7,873
Share dividend (273) (244) (142)
Ending balance 7,213 7,487 7,731
Common shares [member]      
Disclosure of share premium [Line Items]      
Beginning balance 5,834 6,078  
Ending balance 5,560 5,834 6,078
Common share B [member]      
Disclosure of share premium [Line Items]      
Beginning balance 1,653 1,653  
Ending balance € 1,653 € 1,653 € 1,653