Revenue recognition (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue recognition
Revenue from sale of products and licensing	€ 14,216	€ 14,543	€ 7,080
Revenue from services	8,150	8,166	5,421
Contract revenue recognized under percentage of completion accounting	781	932	59
Total revenue	23,147	23,641	€ 12,560
Contract revenues recorded prior to billings	132	129
Billings in excess of costs	151	164
Work in progress on construction contracts	28	57
Advances received	45	113
Retentions		1
Costs incurred and profits recognized, net of recognized losses	€ 1,179	€ 970

The amount of advances received by the entity before the related work is performed on construction contracts.

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

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The amount recognised as an asset 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 costs incurred plus recognised profits (less recognised losses) exceeds progress billings.

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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).

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The amount of progress billings on construction contracts that are not paid until the conditions specified in the contract for the payment of such amounts have been satisfied or until defects have been rectified. [Refer: Progress billings]

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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]

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The amount of revenue arising from the sale of goods. [Refer: Revenue]

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