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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

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- Definition The amount received or receivable from the issuance of the entity's shares in excess of nominal value. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_e&doctype=Standard -URIDate 2019-03-27 + Details
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