Revenue (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue
Revenue recognized in the respective year	€ 317	€ 280	€ 292
Aggregate cost recognized (multi-year)	435	527	294
Recognized result (+ profit/- loss; multi-year)	(104)	(174)	20
Gross amounts due to customers	€ 30	€ 78	€ 41

The aggregate amount of costs incurred and recognised profits, less recognised losses, to date on construction contracts in progress.

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- Definition

The amount recognised as a liability as the net of: (a) costs incurred plus recognised profits; less (b) the sum of recognised losses and progress billings for all contracts in progress for which progress billings exceed costs incurred plus recognised profits (less recognised losses).

+ References

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- References

No definition available.

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- Definition

The amount of revenue arising from construction contracts. Construction contracts are contracts specifically negotiated for the construction of an asset or a combination of assets that are closely interrelated or interdependent in terms of their design, technology and function or their ultimate purpose or use. [Refer: Revenue]

+ References

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- Definition

The aggregate amount of recognised results on construction contracts in progress.

+ References

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