Other information about investments - Additional (Details) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of other information about investments
Non-controlling interest	€ 61	€ 57

The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]]

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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