Segment and Corporate Information - Segment Activities Calc2 (Details) - EUR (€)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Revenue Table
Revenue	€ 3,975,629,000	€ 4,548,120,000
Revenue external customers	€ 3,975,629,000	€ 4,548,120,000

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details