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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

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