Issued Share Capital and Other Reserves - Summary of Other Reserves (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Currency translation
Currency translation, beginning balance	€ (11)	€ (15)	€ (7)
Currency translation	(43)	4	(6)
Gains reclassified to consolidated statement of operations	0	0	(2)
Currency translation, ending balance	(54)	(11)	(15)
Short term and long term investments
Gains/(losses) on fair value that may be subsequently reclassified to consolidated statement of operations	8	7	(2)
Cash flow hedges
Cash flow hedges, beginning balance	(4)	(1)	0
Gains/(losses) on fair value that may be subsequently reclassified to consolidated statement of operations	5	(7)	1
(Gains)/losses reclassified to revenue	(15)	10	(5)
Losses/(gains) reclassified to cost of revenue	11	(7)	3
Deferred tax	0	1	0
Cash flow hedges, ending balance	(3)	(4)	(1)
Share-based compensation
Share-based payments, beginning balance	494	334	200
Share-based compensation (Note 19)	181	127	88
Income tax impact associated with share-based payments (Note 10)	34	26	48
Issuance of share-based compensation in conjunction with business combinations (Note 5)	0	13	0
Restricted stock units withheld for employee taxes	(29)	(6)	(2)
Share-based payments,ending balance	680	494	334
Other reserves, ending balance	1,687	924	875
Reserve of gains and losses on financial assets measured at fair value through other comprehensive income
Short term and long term investments
Investments, beginning balance	1	(4)	(5)
(Gains)/losses reclassified to consolidated statement of operations	(3)	0	2
Deferred tax	(1)	(2)	1
Investments, ending balance	5	1	(4)
Reserve of gains and losses from investments in equity instruments
Short term and long term investments
Investments, beginning balance	444	561	(11)
Gains/(losses) on fair value that may be subsequently reclassified to consolidated statement of operations	777	(149)	720
Investments, ending balance	1,059	444	561
Deferred tax	€ (162)	€ 32	€ (148)

Gains (Losses) on Cash Flow Hedges

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Issuance of share based payments in conjunction with business combinations.

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The amount of reclassification adjustments related to cash flow hedges, before tax. The reclassification adjustments are amounts reclassified to Cost of Revenue in the current period that were recognized in other comprehensive income in the current or previous periods.

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The amount of reclassification adjustments related to cash flow hedges, before tax. The reclassification adjustments are amounts reclassified to Revenue in the current period that were recognized in other comprehensive income in the current or previous periods.

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The decrease in equity through restricted stock units withheld for employee taxes.

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Short term and long term investments.

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The decrease (increase) in equity resulting from tax on transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

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The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, before tax. [Refer: Other comprehensive income]

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The gains (losses) recognised in other comprehensive income on financial assets measured at fair value through other comprehensive income, before tax. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income; Reserve of gains and losses from investments in equity instruments]

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The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]

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A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

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The amount of reclassification adjustments related to exchange differences when the financial statements of foreign operations are translated, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income]

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The amount of reclassification adjustments related to financial assets measured at fair value through other comprehensive income, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

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A component of equity representing exchange differences on translation of financial statements of foreign operations recognised in other comprehensive income and accumulated in equity. [Refer: Other comprehensive income]

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A component of equity representing the reserve of gains and losses on financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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A component of equity resulting from share-based payments.

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