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Acquisitions and Disposals - Summary of Net Assets Acquired and Total Payment for Acquisition (Detail) - EUR (€) € in Millions | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of Detailed Information about Business Combination [Line Items] |  |  |  |  |
Intangible assets |  | € 4,082 |  |  |
Other non-current assets |  | 284 |  |  |
Trade and other receivables |  | 103 |  |  |
Other current assets | [1] | 655 |  |  |
Non-current liabilities | [2] | (1,107) |  |  |
Current liabilities |  | (160) |  |  |
Net assets acquired |  | 3,857 |  | € 771 | € 815
Non-controlling interest |  | (27) |  | (25) | (17)
Goodwill |  | 18,942 |  | 18,067 |
Exchange rate gain/(loss) on cash flow hedges |  |  |  |  | (100)
Total consideration |  | 6,337 |  | 1,167 | 1,194
Consideration paid | [3] | 6,313 |  |  |
Deferred consideration |  | 24 |  |  |
Main Horlicks Acquisition [member] |  |  |  |  |
Disclosure of Detailed Information about Business Combination [Line Items] |  |  |  |  |
Intangible assets |  | 3,345 |  |  |
Other non-current assets |  | 249 |  |  |
Trade and other receivables |  | 77 |  |  |
Other current assets | [1] | 560 |  |  |
Non-current liabilities | [2] | (905) |  |  |
Current liabilities |  | (122) |  |  |
Net assets acquired |  | 3,204 |  |  |
Goodwill |  | 2,090 |  |  |
Total consideration |  | 5,294 | € 5,294 |  |
Consideration paid | [3] | 5,294 |  |  |
Other Acquisitions [Member] |  |  |  |  |
Disclosure of Detailed Information about Business Combination [Line Items] |  |  |  |  |
Intangible assets |  | 737 |  |  |
Other non-current assets |  | 35 |  |  |
Trade and other receivables |  | 26 |  |  |
Other current assets | [1] | 95 |  |  |
Non-current liabilities | [2] | (202) |  |  |
Current liabilities |  | (38) |  |  |
Net assets acquired |  | 653 |  |  |
Non-controlling interest |  | (27) |  |  |
Goodwill |  | 417 |  |  |
Total consideration |  | 1,043 |  |  |
Consideration paid | [3] | 1,019 |  |  |
Deferred consideration |  | 24 |  |  |
Subsidiaries [member] |  |  |  |  |
Disclosure of Detailed Information about Business Combination [Line Items] |  |  |  |  |
Goodwill |  | € 2,507 |  | € 421 | € 496
[1] | Other current assets include finacial assets of €463 million and cash of €36 million related to the Main Horlicks Acquisition.
[2] | Non-current liabilities include deferred tax of €746 million related to the Main Horlicks Acquisition.
[3] | For the Main Horlick Acquisition consideration paid was €449 million in cash and €4,845 million in equity shares. For the other acquisitions all consideration was paid in cash.

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