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Equity - Share capital transactions (Detail) - EUR (€)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity - Text Details (Detail) [Line Items]      
Purchase of treasury shares € (514) € (318) € (589)
Treasury shares transactions [Member]      
Equity - Text Details (Detail) [Line Items]      
Shares acquired 23,767,778 4,618,933 16,591,985
Average market price € 32.58 € 32.47 € 23.84
Purchase of treasury shares € 774 € 150 € 396
Reduction of treasury shares 24,246,711   18,829,985
Cancellation of treasury shares € 783   € 450
Total Shares In Treasury At Year End 4,140,000 4,618,933  
Total cost € 141 € 150