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Segment Information - Summary of Operating Results by Geographical Areas (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |  |
Turnover |  | € 50,724 | € 51,980 | € 50,982
Non-current assets | [1] | 46,430 | 43,744 | 42,111
Country of Domicile [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Turnover |  | 2,391 | 2,306 | 2,385
Non-current assets | [1] | 3,587 | 3,891 | 3,160
United States [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Turnover |  | 9,363 | 8,702 | 8,305
Non-current assets | [1] | 12,946 | 13,326 | 12,471
India [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Turnover |  | 4,993 | 4,964 | 4,565
Non-current assets | [1] | 6,264 | 1,137 | 1,080
Others [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Turnover | [2] | 33,977 | 36,009 | 35,727
Non-current assets | [1],[2] | € 23,633 | € 25,391 | € 25,400
[1] | For the purpose of this table, non-current assets include goodwill, intangible assets, property, plant and equipment and other non-current assets as shown on the consolidated balance sheet. Goodwill is attributed to countries where acquired business operated at the time of acquisition; all other assets are attributed to the countries where they were acquired.
[2] | Includes the Netherlands that was presented as country of domicile in prior years.

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