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Shareholders' Equity - Summary of Share Capital - Par Value (Detail) - EUR (€)
€ / shares in Units, shares in Thousands, € in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [Line Items]      
Issued capital € 323 € 322 € 322
Beginning balance 322    
Ending balance € 323 € 322  
Weighted average shares 2,042,000 2,036,000 2,042,000
Common shares [member]      
Disclosure of classes of share capital [Line Items]      
Issued capital € 253 € 251 € 251
Authorized share capital € 720 € 720 € 720
Number of authorized shares (in million) 6,000 6,000 6,000
Par value in cents per share € 12 € 12 € 12
Beginning balance 2,095,648 2,095,648 2,074,549
Dividend 9,491   21,099
Ending balance 2,105,139 2,095,648 2,095,648
Beginning balance € 251 € 251 € 249
Dividend 1   3
Ending balance € 253 € 251 € 251
Weighted average shares 2,098,326 2,095,648 2,080,792
Common share B [member]      
Disclosure of classes of share capital [Line Items]      
Issued capital € 70 € 70 € 70
Authorized share capital € 360 € 360 € 360
Number of authorized shares (in million) 3,000 3,000 3,000
Par value in cents per share € 12 € 12 € 12
Beginning balance 585,022 585,022 585,022
Ending balance 585,022 585,022 585,022
Beginning balance € 70 € 70 € 70
Ending balance € 70 € 70 € 70
Weighted average shares 585,022 585,022 585,022