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Equity - Employee option and share plan transactions (Detail) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Line Items] |  |  |
Purchase of treasury shares | € 130 | € 621 | € 514
Treasury shares for share-based payments [Member] |  |  |
Equity [Line Items] |  |  |
Shares in treasury, at the start of the period | 5,268,467 | 7,871,452 |
Shares acquired | 5,351,411 | 5,497,675 | 8,226,101
Average market price | € 33.81 | € 34.25 | € 32.59
Purchase of treasury shares | € 181 | € 188 | € 268
Shares delivered | 4,695,170 | 8,100,660 | 10,453,020
Average price (FIFO) | € 34.35 | € 32.87 | € 32.66
Cost of delivered shares | € 161 | € 266 | € 341
Cost of treasury shares for employee options | € 199 | € 180 | € 258
Shares in treasury, at the end of the period | 5,924,708 | 5,268,467 | 7,871,452

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- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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