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Share Buyback Programme - Additional Information (Detail) - EUR (€) |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 27, 2021 | May 06, 2021 | Apr. 29, 2021 | Jun. 30, 2021
Disclosure of share buyback programme [line items] |  |  |  |
Share buyback programme, Amount authorised |  |  | € 3,000,000,000 |
Date of commencement of share buy back programme |  | May 06, 2021 |  |
Share Repurchase Programme 2021 [Member] |  |  |  |
Disclosure of share buyback programme [line items] |  |  |  |
Share repurchase programme expiration date | Aug. 27, 2021 |  |  |
Share buyback programme, Amount | € 1,500,000,000 |  |  |
Stock shares repurchased during the period shares |  |  |  | 17,973,091
Share buyback programme,Amount paid for shares repurchased |  |  |  | € 845,000,000
Amount payable for share repurchases |  |  |  | € 52,000,000

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