The amount of liability representing income that has been received but is not yet earned. [Refer: Revenue]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]]

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Term of non-exclusive license to patents.

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The amount of the transaction price as a percent allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period.

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Revenue recognition - Performance obligations (Details) - EUR (€) € in Millions	1 Months Ended
	Apr. 30, 2014	Dec. 31, 2020	Dec. 31, 2019
Performance obligations
Remaining performance obligation		€ 16,600	€ 18,800
Remaining performance obligation (as a percent)		100.00%	100.00%
IAS 18 Agreement
Performance obligations
Term of non-exclusive license to patents	10 years
Deferred revenue		€ 515	€ 670
2021
Performance obligations
Remaining performance obligation (as a percent)		68.00%	69.00%
Due between 1 and 3 years
Performance obligations
Remaining performance obligation (as a percent)		31.00%	27.00%
More than 3 years
Performance obligations
Remaining performance obligation (as a percent)		1.00%	4.00%