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Financial Risk Management and Financial Instruments - Summary of Changes in Convertible Notes (Details) € in Millions | 12 Months Ended
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Dec. 31, 2018 EUR (€)
Disclosure of detailed information about financial instruments [abstract] |
Beginning balance | € 944
Changes in fair value | 221
Effect of changes in foreign exchange rates | (20)
Issuance of shares upon exchange of Convertible Notes | (1,145)
Ending balance | € 0

X
- Definition Carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References No definition available. + Details
Name: | ck0001639920_ConvertibleNotes
Namespace Prefix: | ck0001639920_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Increase (decrease) of Convertible Notes balance through changes in foreign exchange rates. + References No definition available. + Details
Name: | ck0001639920_IncreaseDecreaseConvertibleNotesThroughChangesInForeignExchangeRates
Namespace Prefix: | ck0001639920_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (decrease) of Convertible Notes balance through issuance of shares upon exchange of convertible notes. + References No definition available. + Details
Name: | ck0001639920_IncreaseDecreaseConvertibleNotesThroughIssuanceOfSharesUponExchange
Namespace Prefix: | ck0001639920_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (decrease) in fair value of convertible notes. + References No definition available. + Details
Name: | ck0001639920_IncreaseDecreaseInFairValueOfConvertibleNotes
Namespace Prefix: | ck0001639920_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration